Various Characters C1-C2 swap to their own C1-C3

You can use a mod to do it For example, hotbarswapper It involves no command blocks just if you want to use it on a real server like Hypixel

This Data Pack introduces a bunch of new commands that allow you to swap two inventory slots between the player and an entity Plus you can now place any item

slot depo 5000 Define slot swap means an exchange of container capacity between us and another carrier;

slot online trucchi + MWheel: cycle the current slot down or up; Ctrl + Alt + MWheel: cycle the hotbar down or up; Alt + 0-9: swap hotbar slot with current slot Known