Just a suggesting - if you look up custom teflon coating on the internet there are places that will do just that. I have no idea if teflon will hold up to refluxing H2S04 though. Teflon is a brand name for a line of coatings produced by Dow or DuPont i think, anyways, in this product line there are like 5 or 6 different formulas with different properties; FEP, PFA, PTFE etc. 3M also manufactures a big line of coatings, off hand Kel-F (PolyChloroTriFluoroEthylene) offers good acid resisitance, again check with a coating company though.
One should call one of these places up and talk to one of their engineers.
Its kinda pricey but they will coat anything ya want. SWIM had a pressure tank for car painting ghetto rigged into a pressure reaction vessle coated with teflon, works like a charm.
Can a bee be visa vis its entity when half a bee philosophically must ipso facto half not be?