Stuck shed???

[Malum Argenteum]

Feeding: he’s been on hunger strike since March 3rd, I’ve been offering him food every/other week and he’s shown interest but hasn’t eaten. Vet said he’s too skinny (did NOT say he was anorexic and never eating again, like prior vet) and said I should try to feed him mice, chicks, or quails. [snip] She said him hunger striking is really really bad but also that it’s completely normal and out of my hands but ALSO something to feel terribly afraid for

The snake last ate 6 weeks ago, which is not a long time. Also, hunger striking is not "really really bad" and not even "really bad", and in normal situations isn't even "bad". It isn't something to be "terribly afraid for". ("Completely normal" gets it right, though.) Did the vet really use these words?

Sounds like you've got a diagnosis on the infection and you're treating that. That's good, and indicates that things are not completely out of your hands.

If you can inject antibiotics, you should be fine to tube-feed. I'd rather tube-feed a snake any day.

I've done both plenty of times, and both are about the same difficulty (=pretty easy) and use roughly the same skills (holding snake securely, delivering the product into the snake). If you decide that you should tube feed your snake, do feel confident about doing so. Exotic animal keepers should expect to learn some kind of odd skills, and this is sometimes one of those skills.