Druid magicians combine the Runic Enchanting rules with Tattoo Magic to create magical rune tattoos that only activate in certain conditions! Sounds great, eh?
It wouldn't really work, because a Quickened spell is not a focus, even if you use Enchanting to make the inks.
But otherwise, the idea of activating and deactivating a Quickened spell by doing something...chanting a phrase, rubbing blood on it, what have you...seems like a neat idea, neh?