Have you thought about forming a US corporation (C Corp or LLC)? Yes, you would have to pay some taxes, but you could choose a low/ no tax burden state like Delaware or Wyoming.

Assign a local agent, with physical/ mailing address, and open a US business banking account is pretty much all there is to it (not all). I've actually considered offering this as a service, but convincing myself there is an actual need has been difficult.

If you can reduce the act of registering a Delaware C Corp and opening a US bank account to entering my billing details, you'll have my business.

I understand Balanced is trying very hard to get into CA as well, so they may be a viable solution for you soon.