I've got to admit I never liked the QulDun, it actually looks like a stepping stone between the T1 B'rel and the 22nd cnetury models from "Enterprise" and IMO it would have been better if the QulDun had been the T1 ship with the B'rel a T2 model.
I can't find any redeeeming qualities on the K'tanco but that's just me.
I know there were actually a lot of excited people back when it came out so why not.
I agree that there are people who do like them and even though I'm not one of them I don't see why those folks shouldn't have the chance to fly their favourites at max-level.
In case of the Somraw you might want to check the database again: it's already in that list as a retrofit. I believe you missed it