lessfog VS foundryvtt-magic-items

Less Fog - Makes the fog of war easier to see through for a GM. Gives a button to toggle between a token's vision and the GM's vision when a token is selected.

Less Fog - lets you control the fog colour for the DM separately from the players. Useful for the DM so they can see what's going on while having tokens selected.

Less Fog

Sounds like you're talking to the right people; good luck getting things set up. For the default lighting changes I was referring to the less fog mod. Not sure it works in v9 (or really in v8 either) but it's something to look at.

Less Fog can make the Fog of War effects transparent for GMs. I don't know why I didn't think of this earlier. You can make it so that even though you only have the token's vision, the areas of that map that are black to the player are just dim or greyed out to you, so you can still see what you're doing.

You could use a mixture of using Less Fog and pre-exploring the area. Drag a token that all players have observer or better access to around the area to fully remove the fog of war, then use Less Fog to change the opacity of the Explored areas to taste.

FoundryVTT Magic Items - This module for Foundry VTT and specific for the DnD5e system, adds the ability to create magical items with spells or feats that belong to the item itself, such as staffs or magic wands, which will be automatically inherited from the character who owns the item.

Magic Items - Allows adding additional spells and such onto magic items directly. Very useful for items that function on charge systems that can be upcast, though a little tricky to work with.

Well there's your problem right there.

Magic Items might help you. I believe you can set it to use multiple charges and scale with number of charges.

a solution could be to code your cutom "feature" into custom magic spells and use the mod "magic items" which let you add spells to magic items with customizable charge cost per spell, number of charges, charges regained at x and so on

What you want is the Magic Items Module... it works with MIDI-QOL and DAE. https://gitlab.com/riccisi/foundryvtt-magic-items

Magic Items

There's an issue for this raised on the module's gitlab page: https://gitlab.com/riccisi/foundryvtt-magic-items/-/issues/82