Nah. I just can't see the tomato going with the gravy. Or the cheese.
Perhaps if they went a bit different. Base the pizza on Fiorentina. Which is spinach and egg, but add sausage.
So you half bake your yorkie, then quickly open the oven and top with spinach and a couple of raw eggs. Oh, plus some sausage, make it Italian if you want to pretend authenticity. I'd argue that ship sailed long ago... Then back in the oven for them to cook. Then top with lots of lovely onion gravy.
Admittedly what I've basically done here is add eggs to toad in the hole, and hidden a few sad vitamins in it with the spinach, that nobody is going to notice.