I’m still experimenting with RPG Maker MV and made a plugin instead of a debug tool this time:
As the name and cover image imply, Equipment Change Hook MV can run a specified Common Event (handler) just after each equipment change (actor slots only). All commands are okay, including further equipment changes.
You also get a range of relevant information through Switches, Variables and JS globals that you can optionally specify in the plugin settings. For example, you can assign the (un)equipping Actor’s ID to a Variable and then use that to update their Status, as shown in the second screenshot (which is blurry here for some reason. It’s not blurry on the plugin page).
The hook triggers both on equipment changes caused by a Command and those made by the player on the Equip screen. You can distinguish one of the parameter pairs. Any other equipment changes should also trigger the hook, as long as they update the equipment like the core engine does.
Please see the plugin page for more details.