Haven't seen any checks or weighings upon boarding, you should be fine.

Boarding is at 00:25, I'd imagine the gate staff as much as the onboard crew and passengers want the flight to get away ASAP anyway so doubt any strict policing would be done to be honest. As it is mostly a holiday destination, I'd imagine most people check bags so it doesn't get that busy in the overhead lockers onboard IME.

That being said, the lounge really isn't anything to write home about… But I understand you wanting to visit.