Welp, I think my GPU luck is going to run out as I’m #2 for 5 seats on UA923 (LAX-LHR) on 2/16.
The annoying part is that the OLCI system offered me the upgrade for $829.
ETA: I jumped at the $829 and am now in 7A. Even better, it shows as “United Polaris Business (Z)”, and I only paid something like $700 for the original ticket.