I'm halfway debating trying to push him in the route of a Shopify site with a BTC pay server. That way he can accept both Bitcoin and fiat, but also advertise on Nostr
Discussion
Sounds solid.
Another route would be setting him up with phoenix wallet set up a lightning channel and you can help him by hosting phoenixd and set that up with btc pay
this is what I was gonna suggest. lots of options on how he can cash out as well. Shopify is a little more expensive, but it has a lot of functionality for someone just wanting to sell stuff and maybe get some Bitcoin for it.