when I wired in my Autotune module, I pulled the wire for the license plate bulb, snipped that off and then had ignition-switched positive and negative leads. That bulb isn't monitored by CANBUS btw so it's no big deal (other than legal) to not have it or to use it for something else.
what I don't know however is how many amps you can pull from that power source. Fixing up leads from the battery is easy, but you would have to put in a relay somewhere so that the fusebox as pictured above shuts off when you turn off the bike.
2012 S1000RR, sapphire black, DTC and HEATED GRIPS
2014 Ducati Multistrada Granturismo
2011 Ducati Monster 796 ABS
2000 Ducati ST4 (sold)
2010 S1000RR (sold)
2007 F800S (sold)