And, I think, can be reached in Celtiberia.
CE has 73 nobles. Admittedly, 28 regions. But they haven't been afraid to take lands from Carelia for the entire war so they are presumably confident of securing as far as Strombran. And that's under the current estate system. If CE wanted to expand its authority on the continent - and lets face it, they do - then I can easily see how they'd be interested in more than one colony resulting from this war. If the estate system came in here on stable, I would believe that the current conflict won't end until they get three.
Maybe I'm overestimating them or their ambition, but the last time I was in CE, that definitely fits the mindset.
Finton.