While not quite the "fine dining" experience, the combination has been proven in at least one location -- Alfredo, Weinstein & Ho in Halifax. It's been around for a lot of years (it wasn't new when I lived there thirty years ago). Unsurprisingly, it's a combination kosher, Italian and Chinese restaurant (the signature dish is something called "Kosher Chinese spaghetti").

It's not quite the "incubator" idea you have, and it may not hit all tastes, but it is a good place to go when people can't agree on a theme, and it's never empty.