third rome

I was just thinking today... how plausible is Imperial Russia using the "Third Rome" (like the crazy Greek Plan from Catherine the Great) excuse and inviting/gathering christian minorities (asia minor greeks), syriac christians, armenians, assyrians and copts? Like a christian zion. Today there...

I know, I know, it's hard af, but do you guys think there is at least a small possibility? venetians, iberians and/or the genoese can also be involved. Pedro Álvares Cabral took ~40 days from Portugal to Brazil, so maybe the byzantines will take ~70 days, if the mission is successful?

Let's say some mastermind Tallyrand-esque figure schemes together a plan to unify the three main claimants of the Roman empire and unite the Habsburg, Russian and Ottoman lands under a single personal union. How would he go about doing this? Your PoD(s) can be as ASB as need be (granted that...