Let’s say it clearly:
The Chinese T-26 is entirely fictional.
China NEVER used the T-26 they’ve got in game, which is the T-26 model 1938. The one they used in real life was the T-26 model. 1933, which has a turret similar (if not entirely the same) to the BT-5 turret.
I believe developers have been told this some times already, but they won’t change it. Don’t know if it’s because laziness or whatever.
Come on, you just need to add the BT-5 turret on the current T-26 and cut some edges of the hull, that’s it! You could even add it as another reserve vehicle in the USSR, taking the place of the T-26 mod.1938 we currently have.