SLCW on Nostr: I don't think there's such a hybrid all-in-one system because of the additional ...

I don't think there's such a hybrid all-in-one system because of the additional requirements and complications associated with receiving fiat. I think you would have to create your own system, possibly leveraging an existing Bitcoin payment system, combined with a fiat system, and integrate it into the same UX. I don't think you'd have any trouble using an existing bitcoin merchant solution alongside a seperate fiat system because there really wouldn't be any cross integrations between the two. You could use the UX as the front to direct users to either the bitcoin system, or the fiat system. That's my two sats.