InventoryEssentials is already able to change which items you have equipped, by using SPACE + CLICK, however I don't understand how exactly the logic of this is, as I show in the video it seems to have many inconsistencies

it would be interesting to have a specific hotkey to change armor, such as ALT + CLICK, where the mod would look for similar armor around, example another part of the armor in the slot next to it, you could have several armors in the inventory and change whenever you want, and the removed armor would swap places with the new one, swapping the slots

currently there is no Fabric mod that adds this function, the closest is VanillaTweaks which adds Armor Swap but with Armor Stands

really cool, thanks

I think overriding space click on armors in the inventory is a good idea without requiring a new keybind.

The difficulty would be in identifying matching armors, because there isn't any metadata left in the item that maps a set of armor to one another. The best this could do is work for the vanilla armor types or a best-guess approach using the item names.