> Server wages would have to be adjusted first
Yep, that's what we wish for your waiters and waitresses: to be paid correctly, so they can enjoy a salary that does not depend on their appearance and the customer's mood and the state of mind of all parties involved, and so we can have the right price upfront when choosing from the menu and not feel pressured to pay more when leaving. If you want to sell me fries for $5, service included, just put it like this on the menu already. Abstract away the implementation.
While we are at it, please display the prices with all taxes included, in your shops too, I don't care about the prices without taxes, and I don't care for computing the tax myself, which varies from cities to cities :-)