Originally Posted by 1111

It turned out I was unable to try this.

For a more conventional datapoint, I checked in at the airport 3 hours before departure, and was told UG were on waitlist to be processed at gate. At 25 before scheduled departure (20 before newly-announced delayed boarding) they paged about six names, and the first three of us were all using paper SWU to UG.

I'm now 3/3, twice on LH454 and once on LH459, all within 3 hours of departure.