Hmm... that's interesting, I didn't think about that. Definitely not gonna proxy, that's for sure, I wanted it to be serverless.
Welp, I don't know how it could be done then. I would ping Dessalines or Nutomic, but I haven't really decided to start working on this, so I won't bother them. But if anyone feels like going for it, I'll be happy to lend a hand.
Edit: I just saw there's an open PR to allow CORS. I guess we'll see how it goes.