I suggest you trying this plugin with the Triacontane's SceneCustomMenu, which requires the PluginCommonBase, usually found on \RPG Maker MZ\dlc\BasicResources\plugins\official (often as "pluginbasefunctions.js").
You can make a menu that changes skills and equips mainly using the RPG MAKER MV / MZ Script Calls - Google Sheets as reference. It's boring, but not hard.
I briefly tested one of my menus that shows who is equipping what, and it apparently worked.
Alternatively, you can try generating a variable with the desired value according the troop ID, making a preview with of the battle emulating a battle scene, then using the plugin you have for changing skills. It can goes with plugin that alters battle transition, or let you use these effects outside the battle (when loading the pictures emulating it, maybe).
Also, try a confirming dialogue after the menu is closed. "Do you wanna fight or keep changing the skills?" So you call the battle instead of auto-running it. Idk.