This is indeed a tricky situation for someone intent on becoming a new age gypsy...
First, make sure that the vehicle is kushti and not some cast off from the Third Reich when the external gas point was used in the opposite direction. Perhaps placarded "Achtung! Nur für Zyklon B!". Use of an orifice in other than the maker's intended direction would seem to be common amongst
gas users though...
The aversion to the only true fuel in some parts of Europe is probably because, as the summer progresses, the sites can become more inflammable than a London tower block as the trees and general bondhu become tinder dry.
There must be some website which lists those sites which allow you to use the only true fuel provided that you also take a couple of red boys, stored pressure water, for use in case of emergency? But if not, then I'm afraid that you'll be stuck with recycled bottled ar$e exhaust and getting in touch with your
gay side? Or just say that you're temporarily using your kitchen cooker in the open air?
But you'll probably meet some 'interesting' friends who will admire your scatter cushions, pot pourri and chintz curtains....