In reviewing some threads here it seems I am going to be staying at a hotel that has security at the elevators. Being that many of my colleagues will be staying at the same hotel I would prefer not to have to meet a lady in public to go back to my room. I'm sure I'm nowhere near the first with this issue and thought maybe some of the ladies may have a creative solution.

I have gone into the gift shop and bought a bottle water, and when my client and I saw each other we simply walked near / by each other and he handed me off a key

Nice idea
Met a girl in the bar once, her request, sat beside her and slipped her the key and then headed up to the room.
Took her about 20 minutes to come up, said guys kept sitting in my seat and trying to pick her up.
Next time I let her leave 1st and followed her up.

Lol...yr funny!

A friend was stopped by elevator security at Venetian in December. He said he was meeting a friend and security asked him what the room number was and my name. Security made a call up to my room and asked if I knew him before letting him through. They didn't ask for his ID.

I've done the key card hand-off in the gift shop or at the bar.  Some of these ladies will already have room keys for these hotels.  When I send my confirmation email/text, I let her know which card design the hotel is using.

I was recently at Elara and they have a guard with a machine that reads your room key card to check if it is valid.  So no more saving an old key to show to security.  Likely just a matter of time until we see more of those around town.