Sorry if I came across as pedantic, I was just trying to be clear about the main design obstacle it faces. Also I know edits don’t always come across properly across the Fediverse, but I tried to provide more practical advice in the second paragraph:

In general, the more expensive the appliance and the more significant of an installation it requires, the more likely people will go to more extensive lengths to repair it. From that point of view, a proper convection oven is likely to be more repairable than a small desktop air fryer. You can get an appliance technician to come to your house to replace the fan on your convection oven, not so much on an air fryer. And at the end of the day, they’re pretty close to the same thing. Just one is bigger and more repairable. You might need to adapt recipes a bit.

I don’t have a specific brand or model to recommend so I can only offer general advice, sorry if it’s unwelcome, I’m not trying to be unhelpful or rude.