I'm mainly on the AC forum, where there is a strong preference not to start new threads, so I'll ask my napcabs access question here (am not sure of the custom in the Lufthansa forum).

If I fly EDI-FRA-YUL, with an overnight in FRA, would be be able to reliably access the napcabs instead of a hotel? (Is there any chance I'd end up somewhere I couldn't access Terminal 1, transit area B) without going through customs/security?

When I do this trip I typically arrive late (9pm) and depart earlyish (9am), and find that by the time I get through customs, get to a hotel, then get back to the airport in time to get through security, customs, etc., it's just a pain and I end up getting a poor sleep. It occurred to me I could perhaps just use the napcapbs 10pm-6am and then head to the Senator or Maple Leaf Lounge for shower, breakfast, etc.