I'm soon-ish flying CPH-AMS-XXX with a long (5h) layover. At AMS I will go landside to pick up a friend with no status flying Y on KL. It will also allow me to go for a brief smoke before the long haul segment.

I'm thinking on how to handle this best, trying to reduce wait times for both myself and the travel companion, myself having STE+ and Privium, flying J KL.

A few questions:

1. Is there any possibility to get whomever is checking in my friend's luggage to add SP to the boarding pass?
2. If not, how risky is it to give him mine with SP and use the Privium gate myself (in extremis carrying his, in case of the elusive random checks which never happened to me so far)?
3. I have 2 guest vouchers left for the Privium lounge. If we decide to use the lounge before security, and then have too much time to kill after security, would that cost me both vouchers if I wanted to enter the Privium lounge there? (If so, we might opt for L52 instead as I can guest him there).
4. any other "hacks" to make security and kmar passage as smooth as possible?

I think I know AMS pretty well, but some of you out here just basically live at AMS.

Travel is scheduled in 2 weeks, repeating a similar (but different) itinerary in October. Any advice is appreciated!