Ketogenic Food Forest in Zone 7A (Tulsa, OK) ?

I'm interested in a food forest but I eat a ketogenic diet.  Which means I eat lots of veggies except for the starchy ones and no fruit but berries really.  I guess there might be a few keto friendly fruit trees, like lemon and perhaps some sort of other fibrous berry sized fruit.    I know I want to grow a lot of raspberries, blackberries, blueberries and strawberries eventually since that is mostly what I eat with respect to fruit.

I can eat most nuts.

Any ideas of what smaller/dwarf  trees would grow well in Zone 7A (Tulsa, OK).  It's gets both really cold and hot here.

Do you get plenty of rain?
Berrywise the nitrogen fixing ones like Goumi, Sea Buckthorn,  Autumn Olive and Silverberry might be a good fit.
Consider groundnut , chinkapin oaks, full sized or dwarf ,(they can be eaten without having to leach them of tanin), and hazelnuts.
For greens,  grapevines,  linden trees,  mulberry and toon trees all have edible leaves.

The Plants For A Future website has a database that can select plants by zone, edibility rating,  sun requirements  what parts are edible and a bunch of other criteria.
It's a great place to start looking.

Although approaching the question from a slightly different angle, I think there is relevant discussion in this thread:

https://permies.com/t/25934/Food-forest-dream-fruit-sugar