Dont know the GVG so i havent got a clue . BUT ....... in my opinion useing a copper screen for something .... especialy as small a DMT dose ...... because copper conduccts heat better is a bit of uneficcient efficiency unimprovement . The difference between that and a stainless steel sceen or a normal bong screen is ? = Not much .

If normal sceens dont fit needs the way to go would be glass or keramic .