Well, the Vatatzes' Despotate, could, perhaps establish with all their holdings their own rival Byzantine Empire like Nicaea or Trebizond against the Latin ruled one. Or, perhaps, o more appropriately even could follow a similar way to the OTL Ottomans followed and slowly would go taking all the Empires' territories until would be in position to lay siege in an isolated Constantinople. But, anyway, (even if clearly, another civil war would be the last thing that the Empires would need), if it would come to this, the things would in certain way simplify the things. Given, that the Magnates or Patriarchate Hierarchies supporting the losing side, would ha ve their lands confiscated. Also, even if avoiding those so extreme situations, the land (latifundia) possession/tax system structure and the Byzantines magnates power position in relation with their emperor, would,IMO, be radically changed with a new emperor which would count with his own independent source of resources and manpower.Problem is that the Palaiologos have completely squandered the potential of the ERE by giving out massive land grants and tax exemptions to aristocrats with little to no military obligations as a price for helping them take over the throne. What is already given cannot easily be taken back except through force, and in the end the Laskarids were deposed primarily because they tried to fight those corrupt aristocrat for resources. Even if the Laskarids were to find themselves back on the throne right now, they would have to fight those corrupt aristocrats and possibly the church as well for the revenue of those lands. Plus, the Byzantine system of anyone and their mother having a claim to the throne is clearly inferior to the western one, so I believe a degree of deep cleansing and replacing the elite with more loyal and Western-minded ones is somewhat of a necessity.
They would also alienate their Latin subjects if they don’t convert, which they now have many, in both Sicily and in the remnant of the Latin Empire itself. Hence the need for a compromised approach. Union of Churches. Recognise the pope as the supreme leader, but have the Church remain under Byzantine rite. Have a very clear agreement with the pope.
First, step would be to take into account that the terms matter and this OTL one have their own meaning and that for the Easterns 'Union' had to mean or so was interpreted as submitting and renouncing to their own tradition, language and doctrine. Thus, I would suggest to start for eliminate any reference to 'conversion' or to 'union' and to use the more appropriated of 'reconciliation' ((between long estranged sisters Churches).To be in communion with the western Church and the Pope yes. To abandon Eastern Christianity no.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://en.m.wiktionary.org/wiki/Uniate_Church&ved=2ahUKEwim-cyxrbj9AhU8TaQEHZvcCVkQFnoECAwQAQ&usg=AOvVaw1wa6akT2DSDFhianx5c2-P (Uniate Churchs)
But, in more practical terms would be ideal if (taking advantage of incoming the Leadership/Schismatic crisis) and rejecting the Papacy Ultramontanism would be possible come to apply a more or less similar concept to that the actual canonical one of Sui Iuris Churches. That the Christendom is formed by a serie of Autonomous/Particulate Churches that if well under the Papal direction, they still have their own elect/chosen leaders and keep their own finances, rites/liturgy/liturgical languages. Of course that in normal times and for most of the Roman Pontiffs, it would be considered unacceptable.
Of course, this would assume and taking a step further to the above mentioned, that the Bishop of Rome, only would be recognized/accepted, 'only' as Primus inter Pares. Now, of course, barring some sort of unlikely sort of compromise respect to doctrinal independence, it, the doctrinal differences would be an extremely important matter, if not the most, and one that would have to be tackled. Before to think to any kind of possible reconciliation that would allow the reunion from both Churches.
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