In Theory (TM)! How to return an Umbraco Form HTML from an ApiController

FormHtmlApiController.cs

using System.Web;
using Umbraco.Web.WebApi;

namespace My.Website.Controllers.Api
{
    public class FormHtmlApiController : UmbracoApiController
    {
        public IHtmlString Get(string id)
        {
            return Umbraco.RenderMacro("FormsRenderForm", new { FormGuid = id });
        }
    }
}