/pvp [nickname] command to pvp with players

Origin realms has a lot of cool stuff, but saddly players cant pvp. so i have idea of /pvp command.

How does it works? first_player types /pvp 2nd_player and 2nd_player accept pvp or decline, if they will accept it pvp for them will be turned on and they can off pvp anytime they want (and there will be no item loosing, when player kills his opponent pvp just ends ig, no armor breaking, nothing loosing all returns after pvp ends)

Why do i want it? first of all, pvp is a part of minecraft, and i rl want to make a lot minigames for players but unfortunately a lot of them using pvp so ye 😢

you cant pvp at spawn, boss arenas and other places idk which ones