Just as a follow up for Bluesdawg and others, the mountain double front derailleur solved the problem completely. It is necessary to adjust the height so that the cage just barely clears the outer bash ring while shifting up to the mid (high on the mountain double crankset) ring. At that point, the inner and outer cages can be adjusted so close to the extreme positions (inner/inner and outer/outer) that the derailleur acts as a chain keeper.

This restores the ability to use what might be my favorite feature of twist shifters, the ability to drop from the high to low chain ring while simultaneously changing up 3 or 4 gears on the cassette. All done in one pedal rotation. This is the dreaded 0 change shift while moving from the inner front ring to the outer and vice versa. Traditional shifters may choose not to, or be unable to make this change in the same quick motion.