Alright, at a great personal sacrifice, I uninstalled this

Seemed to work fine. The only change I had to make to your instructions was that I had to rebuild my bash patch after removing the mod patches. I'm running New Roads & Bridges as well, and had imported the road records for OCR. I removed that as well and found that the game wouldn't start. Rebuilt my patch and it was fine. Then finished uninstalling everything and the cities all reverted back to their closed ugliness

Of course my city clocks were gone, but I didn't bother reinstalling Clocks of Cyrodiil. What I did think was funny was that my undiscovered city markers went back to being discovered before I had re-visited the cities! I'm running MMO, which I'm sure you're well aware of by now

So the city castles went back to being discovered again.
I'm also pleased to report that I was able to re-install again afterwards and things seem to be fine. I have to run around to all the cities, but a quick check of the nearest city seemed to be fine. And my map markers went back to be undiscovered again. *contented sigh - all is right with the world*

Did all this with BAIN.