Originally Posted by
grigoryt
Next trip is LED-MUC-EWR--SAT and I'm sadly sure that I'll get a BP for LED-MUC and then in MUC kindly ask US to issue my further BP in an hour before the next flight. Works, but no lounges, no duty free

Are you talking about MUC when you say no lounges and no duty free? Once you get there, you should be able to check in and get a BP one way or another. Are you saying there's no way to check in up until an hour before your flight? There's no kiosk, UA desk is closed, and an LH transfer agent can't help you?
The agents at the lounge can see your PNR, and if you're supposed to have lounge access they might let you in even without a BP. They might even be able to check you in!