Oh my, this is hard on distance :D Then try this!
EDIT: I just tested this, doesnt seem to work, im confused about that. Ima go try something, give me a while!
EDIT2: Okay its clear to me now. The numbers are worked into the textures themselfs, Switching them will require manual work, sucks =/ You could try to export the corrosponding .dds as a .bmp and photoshop the numbers right and convert them back, that would be 1 way.