What if you remove your saves for this game?
(Move both game\saves
and %appdata%\RenPy\<gamename>
somewhere else and start a new game)
The issue was when starting from scratch, I was not loading from any save file.
But just in case I forced it to use angle 2, and then followed the suggested course of action: Deleted the saves from both locations and tried again. No dice, the result was the same, the urm mod did not show.
I did find a solution though: Making a manual save, exiting and restarting, then loading that save!
The next issue was that the renaming feature did not replace the name of the MC.
Changing the value of persistent.MC did the trick though! So, mission accomplished!