This is very creative, and I suspect would work.

It does have the side effect of wasting the time of 1+n engineers for that hour. I might be able to rustle up a few in month 1, but I'm not going to ba able to do it monthly.

Frankly, as long as the builder has a "support contract" option, that should be sufficient.

I will add that understanding how business works is a huge help to them to get you paid. I advocated for supporting a project (they have a "sponsored by" marketing on their web page, so we could take it out the marketing budget.) But they could only be paid via PayPal (which unfortunately we can't do) do the deal fell through.

It didn't help that the home page in question contained lot of sarcasm, and was antagonistic in tone, likely (I suspect) because of the nonsense the maintainer had to wade through. Ultimately no money got sent.

I'm happy to support OSS, but I can only spend so much social capital on doing so. My advice to maintainers, if you want sponsorship, put some effort into making that channel professional. It really helps.