Yeah, something like PPP seems to be the way to do it. But it seems non-trivial to implement in reality. Gumroad consequently charges 10% fees.
I think it is very unlikely that Datastar would implement something like this - but just as a matter of limited time, rather than lack of empathy with the situation.
Still, people are welcome to bring it up in their discord - perhaps they will actually do it!
And i say all of this as someone who lives in central america, and am building a nonprofit project for which i have zero funding assistance. I already bought the pro license (which is 60% of my monthly cost of living...), mostly just because i see huge value in it all and wanted to support them.