Some great talks at the NHC to listen to, Jim, when they get posted. Michael Tonsmeire said you can make a starter with Roselaere or you can just go with US-05, together with the dregs from some commercial sours that you like. Essentially, the Brett, Lacto and Pedio will be sitting long enough that they will do the work. If you are concerned with not having enough for them to eat, you can add some malto dextrine or lactose upfront to specifically feed the bugs without worrying about the aggressiveness of the Sacc yeast.
I haven't read his book, but I got it at a discount at the NHC and it is available at a discount through the AHA, I believe.