And i'm sure this idea gets rejected

A copyslot world. I never use copyslots that much, but when people do i might understand that they forget what was in what copyslot, or in what direction it was after rotates and mirrors.
Maybe something like /showcopyslot # or /scs #.
That shows you a small world, with that copyslot 'loaded'.
And i hope there is a command like /back

There might be some problems with this, as my copyslot 1 isn't your copyslot 1.
So if i TP to you, i need to be in your copyslot 1. Or disable TP at all, but i think thats harder to solve.