Texas and Rio Grande Scenario

So lets say that the Republic of Rio Grande manages to break away from Mexico along side Texas. Like in OTL Mexico does not recognize the independence of either state and threatens to go to war if the US annexes either. Like in OTL the US decides to wait before making any moves and both Texas and Rio Grande manage to stay independent for at least a few years.

This poses a problem: both nations claimed the strip between The Rio Grande and The Nueces River. Rio's capital, Laredo, actually lays in the disputed area. I would imagine that a conflict between both nations would arise very quickly and that they might actually go to war over it.

There is also the threat that Mexico is still trying to find a way to reclaim the lost territories. If it manages to pull its internal affairs together it might attempt to do so by force. And what better opportunity to do so than the time in which the rebellious territories are quarreling against each other.

Meanwhile the US is still in the hopes of annexing Texas at some time soon. But would prefer to avoid getting tangled in such a conflict. It still however supplies Texas with arms and volunteers. Although Rio would have a population advantage Texas might have an advantage in quality of its men.

Whatever the outcome the war would give both Rio and Texas a chance to develop an identity of their own. Which would make the need to remain independent from either the US or Mexico much more of a priority.

Could it be possible that at some point, before the US formally enters the war, in one way or the other, that Texas and Rio would rather unite under a single government (take in mind this might be be force) and remain independent?

The Republic would consist of the Mexican states of Coahuila, Nuevo Leon, Tamaulipas, plus Texas and the part of New Mexico Texas claimed.
I guess that in order for this not to be to ASBish the northern chunk of the former Texas Rep. (ei the little strip in Colorado) will end up in US hands. And possible the US might at some point buy the land west of the Brazos River (this includes what is today Dallas) from the New Republic.

The US also ends up with some land from Mexico, most importantly its very coveted San Francisco Bay Sacramento Valley the Utah Fertile Strip and some other land further south.

What do you guys think. Is the Greater Republic of Rio Grande a possibility? (I would think Republic of Rio Grande seems to be the more apropipate name as now the River would actually flow across the whole republic).
 
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