Right. However, traditional pre-WWII greaseproof paper didn't contain them (as that was before organo-fluorine chemistry was commonplace), and it worked pretty

Right. However, traditional pre-WWII greaseproof paper didn't contain them (as that was before organo-fluorine chemistry was commonplace), and it worked pretty well. Why not simply revert to that? It may not be as efficient as paper laced with PFAS but it would certainly be good enough.