UDT goes on assigning measure to 2 + 2 = 5

That's not what happens in my conception of UDT. Maybe in Nesov's, but he hasn't gotten it worked out, and I'm not sure it's really going to work. My current position on this is still that you should update on your own internal computations, but not on input from the outside.

ETA:

UDT is not what I want to map my preferences onto, it's not a difficulty of mapping.

Is that the same point that Dan Armak made, which I responded to, or a different one?