Why not just put two engines then?
Tbf at some point they probably stopped and evaluated their resources. For one, twin engine Kizilelma is going to be ~another aircraft in roughly same shape and form, and the current one at best will serve as a proof/demonstrator.
Furthermore, engine situation is already bad(it's same engine with JL-10, meaning exact same problems with supplier), increasing demand by a factor of two won't really help. Two AI-25? Well, kinda, but it's a scrapyard 60 year old engine. It isn't a viable solution to move forward, especially to fit topline equipment Baykar is eyeing for their drone.
And if you hope for your own engine - do one. It's just more volume efficient. Plus, again, no need for complete redevelopment of insides, stronger engine can still fit in roughly similar airframe.