I think it's fine too- wouldn't bother me at all.

I just had to write as you mentioned not liking the set menu idea but I think you need to negotiate a fixed range of dinner choices at the same price per person so everyone pays the same. It would be horrible to have the hassle of working out the bill at such a special dinner.

Then make sure guests have to get their own drinks at the bar so they are paid for up front- no nasty surprises on the bill at the end!