Could Czar Ferdinand have refounded the Byzantine empire?

When I was reading "The Guns of August" I noticed near the begining it says
King Ferdinand of Bulgaria who annoyed his fellow sovereigns by calling himself Czar and kept in a chest a Byzantine Emperor's full regalia, acquired from a theatrical costumer, against the day when he should reassemble the Byzantine dominions beneath his scepter
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Is it even remotely possible that he could have accomplished even part of his grand ambition?
 
The only way I can think of is a series off very lucky breaks for Bulgaria. They'd have to decisively win an equivalent of the Balkan Wars. That's not impossible, but considering that they ended up at war with basically every single other Balkan country it's difficult. It's unlikely that even if they take Constantinople in these wars that the Great Powers would let them keep it. Russia is the big obstacle here.

You'd have to badly screw over Russia for this to work. Maybe if Russia falls into a full-scale revolution around the Russo-Japanese War or in its aftermath, you could weaken Russia enough or damage its international standing enough to make its opinion on what happens in the Balkans irrelevant.

If Russia is not taken out in this manner, then you'd have to have a WWI-equivalent where Bulgaria is on the winning side and Russia and the Ottomans are on the losing side. Perhaps an Entente Ottoman scenario? The problem there is having the *CPs win, but I'm sure it's possible. In the absence of other candidates, Bulgaria would theoretically be able to take and hold Constantinople.

The best he can hope for is Constantinople and chunks of Serbia and Greece, and using this to call himself Byzantine Emperor. Anything beyond this is highly unlikely.
 
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