I am quite satisfied with the standard AW3 trigger shifter,It sits on top of the bar , so fold is unimpeded.
newer one looks rust free, double lever is a convenience.
M bar works for me .. new ones better. Mk2 was bigger than 22.2..

Cityjim can hacksaw down the high priced CF bar if they wish,
[careful of those fibers, your lungs receive them like asbestos ]
a thick wall aluminum one would be a lot more durable.