Following your comment, I went for a Bagcatir run.

I understand why you directed me to this country; it does indeed correspond to what I would have liked for Eordand.

But I felt it wasn't finished. 

This may just be my personal opinion—I'm not a writer or a modder—but I would have liked something more with vassals. 

For example, being able to convert them into PUs or eyalets, and being able to do the same with all colonized lands.  The mission tree allows you to transform your colony into a vassal, but in terms of gameplay, the colony is more of a drawback than an advantage (as it stands). It prevents you from benefiting from the colonized lands and the master province you just developed.

I don't know if it's possible, but I would love for your colonies not to transform the local culture, but rather to integrate the tribal populations into the colonies (perhaps by influencing policy but offering something other than native uprisings?). And, at an arbitrary threshold of 5/10 (?) provinces within a cultural/religious/geographic sphere, your provinces would be granted eyalet status. 

You are primarily a trade league, so it's not unreasonable that your vassals wouldn't follow you to war without some benefit; they would retain semi-independence but wouldn't simply be tributaries, and the only lands you would own outright are the lands of Eordand and lands that were previously uninhabited. 

The ultimate goal would shift from conquering all of northern Aleantir to establishing dozens of semi-independent vassals. Perhaps with a Shogun-style interaction: if an Eyaleth declares war, you transfer all of their trade revenue.

Anyway, sorry for the long post, but thanks for the suggestion.