The problem is it's damn near impossible to actually find a good one that isn't meant for a commercial kitchen.
I've found the fastest way to heat up any food that's supposed to stay crispy on the outside is the microwave it and then bake it. If I could do this at the same time in the same machine that would be awesome.
I love my Sharp microwave/convection combo! Perfect for frozen pie and leftover pizza. 15+ years old now, not sure whether they still make 'em like that any more.
I have one of these, claims to be a combination Microwave/air fryer/convection oven. I was given a broken air fryer once, and when I took it apart to make it work again, I decided that an air fryer IS a convection oven.