Tom -- I don't have too much TEA on hand to play around with, but if you do, go for it. The obvious solution (no pun intended) would be having the AA, phenidone and TEA in something like 50 ml propylene glycol, making it a stock for 1+19 dilution. I know that without the TEA, you can't dissolve ascorbic acid in propylene glycol at that high a concentration. If TEA helps the ascorbic acid (which I imagine it must), it could make for an interesting application.