This is a pretty nice, thought out idea, and I think it's pretty nice, however, you may want to change one thing:
From what I know Patron/Aeugels or whatnot cannot take away power once they gave it. With the Druids, for example, we've had tons of arguments with the LM's over whether or not our Aspects can strip power away from those who turned evil or started using void magic, and the answer has always been no.