I would say that, even if they had a few engineers, they wouldn't have the capacity (manpower/technology) to breach into Constantinople. More powerful people tried and failed.
After that, they'd need to defeat the arabs
Maybe if they go Muslim instead of Christian like the Volga Bulgars or later the fellow Turkic Seljuks (ln OTL it was a close call) they could be like an Early Medival Ottoman Empire and claim to be the rightful rulers of Islam and challenging the Umayyads and others. Maybe if they ally with Saracens in order to do a joint operation against Constantinople. But yes the Walls were hard to breach, and the Byzantines had the Greek fire, which gave them the edge, despite being threatened from all sides.
What if the Bulgars manage to conquer Constantinople, ruling all of Greece, and Anatolia, eventually want to continue the legacy of Rome in Northern Africa ?
What if the Bulgars manage to conquer Constantinople, ruling all of Greece, and Anatolia, eventually want to continue the legacy of Rome in Northern Africa ?
That is a nice scenario to have the Roman Empire to last.
At least in the Balkans. The Slavic-speaking Orthodox entity... Why not?
That has a good potential.
I am not sure about the North Africa though. That's pushing it...
When?What if the Bulgars manage to conquer Constantinople, ruling all of Greece, and Anatolia, eventually want to continue the legacy of Rome in Northern Africa ?