for the amount you're adding, i don't think it'll make much of a difference - but certainly can't hurt to try. i would expect it to take a lot longer to prime, since brett is slow-acting, so if you can't wait a month for it to carbonate (or can't keep it somewhere warm enough that long) you might want to go with sugar.
how long ago did you pitch the 1214? if your beer has been bulk-aging for several months, the 1214 might be dead anyways and you're dependent on the brett for carbonation.
since i'm late to this party: what did you end up doing?
EDIT: nevermind, you got your answers on the duplicate thread - http://www.homebrewtalk.com/f127/mal...-sugar-393157/