Wanderer atop the sea of clouds or whatever on Nostr: Not from the start. I think there would be real value in being a sort of ...

Not from the start. I think there would be real value in being a sort of meta-payment-processor/pledge site. Because a lot of these people are on patreon and subscribestar and that new one (They do an intermediate currency to try and avoid censorship).
Instead of having to manage one more site for the marginal benefit of crypto users, you provide a management interface for all of them PLUS crypto. That could get people to switch just on it's own. You'd barely have to make a functioning payment processor and patreon-site. The rest could come later.