I don't have the means to do it, but I would really like to see it done.
How about destructible coins? Now now, before you leave thinking that I'm mad, hear me out.
By destructible I mean that in order to get the wallet, you have to destroy the actual coin.
How?
Make a little container which holds the private key of the wallet. (this container should be ceramic or metal in order to resist heat)
Make the coin with glass surrounding the container and engrave the public key of the wallet in the outside of the coin. could as well make it all fancy with rare metals for decoration, but the core should be something destructible like glass.
That way you have the wallet inside and the public key outside.
to get the bitcoins from the coin you have to break it. If you don't break it, the coin keeps it's value.

-on a side note, I'm not sure if I'm posting this in the right sub forum. Please move it if it is not appropriate in here.