I am very sorry about the loss of both of your parents, I just can't imagine.
As for the pizza, we don't eat out for pizza as much as we used to. It mainly began when our middle daughter was found to be lactose intolerant. While some LI people can still handle cheese, or small amounts, she was not able to. So in order for our family to eat pizza, we had to peel all of the cheese of of her pizza, put on a slice of soy cheese and melt it. It wasn't quite the same. Once I started finding Almond cheese, we just stuck to only getting a pizza for DH and I once she was in bed, or us making Stromboli, with a special one for her with her almond cheese.
However, we would have been willing to pay extra for a pizza with special ingredients for our daughter. It wouldn't have been something that we did all of the time, but it would have made going out for pizza a lot more workable.
I understand that it is a lot of work, you have to read the ingredients closely, especially with milk (casein, sodium caseinate, etc) and make sure to keep things seperate, teach employees to change gloves and wash surfaces completely. If you live in a largely populated area, I think if you could offer some gluten and/or dairy free pizzas, you could possibly generate business from an untapped market, bring in customers that can't be loyal anywhere else simply because you offer something that no one else does.
Also, you could do a soy pizza and an almond pizza, hopefully you could get people who are able to eat either soy or almond (we actually prefer the almond taste rather than the soy).
Lisanetti is the almond cheese that we would buy (our daughter is now able to tolerate cheese in smaller amounts). Also, it lasts longer than dairy cheese. If you have any local health food stores, you could always see if they carry it as well, in case you were to end up getting more orders than you have cheese.
Good luck with your business! It sort of makes me want to order some from our pizza place, so we just might have to do that tomorrow.