I had a similar idea in December : to keep permanganate crystals and a small bottle of glycerine in a PSK. Each product having different uses.
I bought permanganate in small bags (0.25g/bag) ; I tried to put a drop of glycerine on the crystals of 1 bag >>> nothing <img src="images/graemlins/confused.gif" alt="" />
I guess you need a larger amount of crystals to start a reaction.

Alain