Why not just set up a separate Patreon or pay-pall that is distant from Tsumino? If people are so finicky about hosting or funding a hentai site, or places won't allow you to host when it involves content of this kind, just adapt to the situation that is most convenient.
Create a donation page/link whatever, that is "funding" something unrelated to Tsumino, but it all gets redirected to the site anyways.
Basically a money launder scheme, except the people aren't getting screwed over - we are still able to donate, and you receive the funds to keep the site up + expand with out limiting your options.
It seems shady as hell, and most people will be understandably skeptical, but if your open about it and everyone is aware of what your doing and where the money goes, I don't see how it can be so much of a bad thing.
Hentai is a lucrative industry, and the only thing you can really do is adapt to the current circumstances. I know for sure if people had a choice between paying for porn as a monthly subscription (FAKKU), or donating a few at their own discretion; how many are willing to subscribe? Not a whole lot!
Point is, people may be willing to pay for porn - but at their OWN terms. When people can put a price they are willing to pay (Donations) it becomes more personal and they don't feel like they are getting screwed/burned because it's strictly voluntary. I'd rather donate then have to pay monthly - that's a fact.