Great idea, I'v been doing someting very similar for a while myself
I call them PASS FORWARD COINS, they are all World Traveler coins and they are doing fine.
Here's an exemple for a couple .
PASS FORWARD IN CANADA (TB13E2V)
PASS FORWARD IN SOUTH AFRICA (TB13KKD)
One is on it's way to the US.
I'm having a lot of fun with this and they never get muggled.