Have a separate blank map booted with edited GS that has classic insta cast enabled and a npc with gear that have best stats (Like triple CT r8 set, 4 line weps, etc) which disappear upon leaving the map purely for testing and sandbox and fun purposes.
Either for weird 1v1s among friends or just plain goofing around. Public Instance. If people would enter just to grief other people's 1v1s at least it would be fun PVP or something very different from what we are used to in 1.5.3 without the repercussions of making it permanent.
Also make it cost like 500 ec to enter and player can only be inside for 30 minutes before quest TP them out so that it does not replace the regular EPW experience or need for better gears.
Could give people some fun to be had in between mass pk when 1v1s are either lacking or not up to standards and you looking for something purely funny and cool.
Kind of like a Pw Amusement Park for PVP with cool shit but cost 500 ec to enter and only for 30 minutes.