Zikes...first choice, try Tropical Mexico in Pomona on East End...their sister restaurant is also good. see website 'Catering'...good enchiladas, chile rellenos, and carnitas...they open at 8 a.m.
also maybe Senor Baja (formerly El Taco Nazo, tho very basic menu, mostly tacos/burritos. San Dimas location used to be open for breakfast, so you might catch them early.
desparate- Baja Fresh does "party platters"...a little doctoring, liberal use of cilantro, chopped onions and lots of lime,...you might be able to fake your way through. ;-)