A few things to consider are that sweep & sweep time will affect EQ in some degree, of course using different filter setting sculpts sound (leave room for higher pitched sounds with a LPF, use a HPF to take boom out of a sound, etc.). Plus there are a lot of different gain stages to keep in mind when doing sound design.
Would a 3 band filter for each voice be cool? Sure.
Am I holding my breath and not having fun without that? No Way.