You may want to check out my APUG Amidol thread. I made up a stock solution of Amidol in Propylene Glycol over a month ago and have been checking periodically for activity/stability. It shows no change, to date.
I plan to contact print some 8x10 Efke 100/Pyrocat-HD negs on Azo tomorrow and develop in Michael Smith's Amidol Developer Formula, using my Amidol/PG stock concentrate. I'll let you know how it goes.
Sounds interesting Tom. Yes please let us know how ti goes.