He should talk to folks from BitcoinJungle like Lee and Tico. They onboarded many businesses in the area and they support them with the BitcoinJungle wallet, which is imo better than Coinos in this case (it has POS, it allows holding value in CRC, it has SINPE integration via Bull Bitcoin...). It also gives you lightning address and all the other usual stuff...

Check out Uvita, you can live here just on Bitcoin. E.g. everyone on the farmers market accepts, many of the restaurants, many of people doing services.

Let me know on nostr if you need a contact and I can get you in touch.