best thing i did for autism food related things (as well as empathy) was go vegan
all the processed foods always have the exact same texture and taste. There will never be a bone in my vegan fish. No weird bits in a vegan burger. And my vegan bacon is always spot on perfect.
plus it’s a lot less gross and you don’t have to worry about cross contamination
That sound like more a question about the level of processing the food than a vegan vs. meat based issue.
Granted, fish bones is a special kind of bother but you can have the same sensory experiences with vegan food as well. Expecting seedless grapes, but suddenly the cook used grapes with seeds. Expecting boiled out asparagus, but getting crunchy and some that were probably harvested a little to late. Suddenly getting a little bi of hazelnut shell in your salad.
I agree than going vegan might have some benefits regarding autistic sensory issues, but most of "exact same texture and taste" is more a question of hyperprocessing the food.
I’d love to switch at least some of my meat to the vegan versions but I have a problem with the texture of the ones I’ve tried. Think the ones available here remind me of the overly processed chicken nuggets
and if you’re in the UK, try Unity Diner and No Catch if you’re around london or brighton. They’re spot on, and Unity even do the whole 3D printed meat for not too much more (i’ve never dared try it cause the idea of meat just grosses me out)