To get back to the placement of the Sarranids, they have to be east of the Khergits, but the thing is, in Ormeli lore, you will see that the Ormeli originate from the lands roughly south-east of the Khergits. Their original homeland was there and they actually share the same ethnicity as the people living there, the Gunduz Tribes.(There is a whole section "On the Gunduz tribes near the Gulf of Duagavirva", Ormeli is only the name of the royal house) In the same piece of lore, there is also a desert faction(Shuri) even further to the east, but those obviously don't matter much because we're not going that far east. My point is, If you are going to expand to the east, there needs to be a place for the original Gunduz too because the Sarranids and the Gunduz would be bordering each other. Sarranids could be made to have access to the Gulf while the Khagan of the Gunduz would be to their south continually fighting them.
I actually don't want the Gunduz to be in because it would be even more work to come up with another new faction.
That's why we can give the lore some progress and make it so that the Sarranids would have conquered part of the Gunduz homeland and
the gunduz would not be needed to be put into the game as a faction but rather as a large rebel group who's parties continually spawn and are aggressive to the Sarranid rule. That should solve the problem of the Gunduz living near the Gulf.