I do it a fair bit. I get them to meet at the local casino. Lots of security there and a few thousand dollars doesn't look out of place. I then get them to hand the cash to the croupier who count cash for a living and can spot counterfeits. Also the casino absorbs the risks and you're not under pressure to count correctly.
Then take the chips off the croupier. Again, counting 2x $500 is easier than a bunch of notes.
Scan their QR code on your phone and your done.