Yes, okay. I kinda sorta feel you, but not really. Remove the Russian armies on the German front, put them up against the Turks, so this time the Russians actually outnumber them.
Play the scenario again. Yeah, that's what I thought.
Okay.
Aside from
These Three (okay, they became serviceable after the war started) there were the PDNs Evstafi and Ioann Zlatoust, Tri Svyatitelya, Rostislav and (ex-Potemkin) Panteleimon. The "Empresses" were in fact reliant on British parts, hence the delays, so a German alliance PoD may butterfly either the delay or even the entire series away. So you can have three decent BBs in 1914, in 1915, or just never.
There are additional heavy cruisers Kagul and Pamyat Merkuria, an old one "Prut" acting as a mine layer (but again, could be refitted for fighting), numerous destroyers and torpedo boats and "Almaz" acting as a plane tender.
Whatever else, you'll need a large enough force to maintain presence there even if the "Empresses" never join the rest of the fleet. That and there's Russian aviation (cutting-edge in the bombing department at the time, actually) and the Russian love for mining vast water spaces to deal with as well.
They may be old but they can mob any one or two new ships (as they proved with Goeben and Breslau) so what will happen is that any "moderately sized" Entente fleet will travel together, reducing their effect on the coast.
And even if the Russians completely refuse to come out and play, British forces are inadequate to stage dangerous landings. We have good examples from WW1 for that as well.