Exactly. Better yet: just increase the exchange rate for the customer to effectuate a discount.

As a bitcoiner who probably has a good idea that the exchange rate has been hovering around 104K, imagine a coffee shop offering you 107K to spend your sats instead of dollars. You check your phone to confirm: hell ya, that's a good rate right now. If that's me, I'm choosing to spend sats; and more importantly, I'm making that my new go-to coffee shop.