index.js

registerPatcher({
    info: info,
    gameModes: [xelib.gmTES5, xelib.gmSSE],
    settings: {
        label: 'Weightless',
        templateUrl: `${patcherUrl}/partials/settings.html`,
        defaultSettings: {
          weightModArmor: 1.0
        }
    },
    execute: (patchFile, helpers, settings, locals) => ({
        process: [{
            load: {
                signature: "ARMO",
                filter: () => settings.weightModArmor !== 1.0
            },
            patch: rec => {
                let originalWeight = xelib.GetValue(rec, 'DATA\\Weight');
                let newWeight = parseFloat(originalWeight) * settings.weightModArmor;
                xelib.SetValue(rec, 'DATA\\Weight', newWeight.toString());
            }
        }]
    })
});

module.json

{
  "id": "weightlessPatcher",
  "name": "Weightless Patcher",
  "author": "Predence00",
  "version": "1.0.0",
  "released": "0/0/2019",
  "updated": "9/28/2019",
  "description": "A patcher to change item weights.",
  "requires": ["unifiedPatchingFramework"],
  "moduleLoader": "UPF",
  "canHotLoad": false
}

partials\settings.html

<h2>Weightless Patcher</h2>

<section>
    <label>
        <span class="input-label">Armor Weight Mod</span>
        <number-input type="decimal" model="settings.weightlessPatcher.weightModArmor"></number-input>
    </label>
</section>