Your talking about a two layer nylon belt! Those are thick and not typical by any means. I wore the same clip for the last 10 months on my leather belt and never had a problem.
I doubt they will redesign a holster for an atypical belt, but they may well do it. Best bet is to get a Nite Eyez case, this fit on my LCE belt when I was in the Army. Has a snap and does the job.