most of it is rubber anyways.

Just some fancy braid around it.

Very few actually sell PTFE lines.

And those that do are either ebay esque places like frozenboost.com or others like a place that claims they meet SAE 30R7 yet are rated for 1500 psi

30R7 is carb fuel pressure levels working (~50, ~250 burst), 30R9 is injection fuel pressure levels (100 working, 900 burst).

I realize you're not replacing fuel lines here but I'm just providing examples here.