Extension to post by @rpeplau to resolve RTE tokens in Experience Editor mode for site specific purposes http://blog.peplau.com.br/en_US/site-specific-richtext-editor-profiles-custom-source-in-native-richtext-fields/

EditHtml.cs

using Sitecore;
using Sitecore.Data.Fields;
using Sitecore.Diagnostics;
using Sitecore.ExperienceEditor.Utils;
using Sitecore.Globalization;
using Sitecore.Shell.Applications.ContentEditor.RichTextEditor;
using Sitecore.Web.UI.Sheer;

namespace Konabos.RteSources.Commands
{
    /// This resolves the profile when the Rich Text Editor is opened in EE mode
    public class EditHtml : Sitecore.Shell.Applications.WebEdit.Commands.EditHtml
    {
        protected void Run(ClientPipelineArgs args)
        {
            Assert.ArgumentNotNull((object)args, nameof(args));
            if (args.IsPostBack)
            {
                base.Run(args);
            }
            else
            {
                string parameter1 = args.Parameters["itemid"];
                string parameter2 = args.Parameters["language"];
                string parameter3 = args.Parameters["version"];
                string parameter4 = args.Parameters["fieldid"];
                string parameter5 = args.Parameters["controlid"];
                string parameter6 = args.Parameters["value"];

                Field field = Client.GetItemNotNull(parameter1).Fields[parameter4];
                Assert.IsNotNull((object)field, "field");
                SheerResponse.ShowModalDialog(new ModalDialogOptions(new RichTextEditorUrl()
                {
                    Conversion = RichTextEditorUrl.HtmlConversion.DoNotConvert,
                    Disabled = false,
                    FieldID = parameter4,
                    IsPageEdit = true,
                    ID = string.Empty,
                    ItemID = parameter1,
                    Language = parameter2,
                    Mode = string.Empty,
                    ShowInFrameBasedDialog = true,
                    Source = SourceHelper.ResolveSource(field.Source, parameter4), /* this is the only change */
                    Url = "/sitecore/shell/Controls/Rich Text Editor/EditorPage.aspx",
                    Value = parameter6,
                    Version = parameter3
                }.GetUrl().ToString())
                {
                    Width = "1200",
                    Height = "700",
                    Response = true,
                    Header = Translate.TextByLanguage("Rich Text Editor", Language.Parse(WebUtility.ClientLanguage))
                });
                args.WaitForPostBack();
            }
        }
    }
}

ResolveRteLookupSource.cs

using Sitecore.Pipelines.GetLookupSourceItems;

namespace Konabos.RteSources.Pipelines
{
    public class ResolveRteLookupSource
    {
        public void Process(GetLookupSourceItemsArgs args)
        {
            if (!args.Source.Equals("site:rteprofile"))
                return;

            // Resolve the token using whatever logic you need. We'll hardcode for this example.
            args.Source = "/sitecore/system/Settings/Html Editor Profiles/Rich Text Full";
            args.AbortPipeline();
        }
    }
}

RteTokenLookup.config

<?xml version="1.0"?>

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:set="http://www.sitecore.net/xmlconfig/set/">
  <sitecore>

    <pipelines>
      <getChromeData>
        <processor type="Konabos.RteSources.Pipelines.RteTokenSourceChrome, Konabos.RteSources"
                   patch:before="*[contains(@type, 'GetRenderingChromeData')]" />
      </getChromeData>

      <getLookupSourceItems>
        <processor patch:before="*[1]" type="Konabos.RteSources.Pipelines.ResolveRteLookupSource, Konabos.RteSources" />
      </getLookupSourceItems>
    </pipelines>

    <commands>
      <command name="webedit:edithtml" set:type="Konabos.RteSources.Commands.EditHtml, Konabos.RteSources" />
    </commands>

  </sitecore>
</configuration>

RteTokenSourceChrome.cs

using System.Collections.Generic;
using Sitecore.Data.Fields;
using Sitecore.Pipelines.GetChromeData;

namespace Konabos.RteSources.Pipelines
{
    /// This resolves the RTE profile for the field webedit toolbar in EE mode
    public class RteTokenSourceChrome : GetChromeDataProcessor
    {
        public override void Process(GetChromeDataArgs args)
        {
            if (!args.ChromeType.Equals("field"))
                return;

            Field field = args.CustomData["field"] as Field;
            if (field != null && field.Type != "Rich Text" && !field.Source.StartsWith("site:"))
                return;

            string profilePath = SourceHelper.ResolveSource(field.Source, args.CommandContext.Items[0]);

            if (profilePath == field.Source)
                return;

            profilePath += "/WebEdit Buttons";

            this.AddButtonsToChromeData((IEnumerable<WebEditButton>)base.GetButtons(profilePath), args);
        }
    }
}

SourceHelper.cs

using Sitecore.Data.Items;
using Sitecore.Pipelines.GetLookupSourceItems;

namespace Konabos.RteSources
{
    public class SourceHelper
    {
        public static string ResolveSource(string fieldSource, string itemId)
        {
            return ResolveSource(fieldSource, Sitecore.Context.ContentDatabase.GetItem(itemId));
        }

        public static string ResolveSource(string fieldSource, Item item)
        {
            if (!fieldSource.StartsWith("site:"))
                return fieldSource;

            var args = new GetLookupSourceItemsArgs { Source = fieldSource, Item = item };
            Sitecore.Pipelines.CorePipeline.Run("getLookupSourceItems", args);

            return args.Source;
        }
    }
}