For the second option, you can use decorations with scripts.
The basic script for the key will be like this:give key 1entity delete memap return
Oh! ...Okay, thanks a lot.
I forgot to ask... How do you assign a script to a decoration?
You must name this script identical to the decoration name.
I did that but it didn't do anything...
Did you name the script correctly? Have you tried using the decoration with the E button?
The E button did the trick, thanks a whole lot. I'm gonna change every other key to work the same way to keep things consistent from the player's perspective, though. Don't want them to get confused by a sudden change of rules.