What about if you make all equipment one time use, like when you equip it once, only your acc can equip it in order to equip it with a alt you'll need to buy like x amount of "Perfume", imagine you need 5/5 to unlock a wep, which could cost 25m to act as a slightly gold sink. For example let us say you buy a clean maul (the seller looted it from event, he didn't opened it) the wep would be unlocked then if i equipped it, it would become "locked" this means other users could not use it but they can trade it to merch or anything. This feature is running perfectly on many mmorpg games, such as nostale, eastmile, nosvoid and many others.