It seems like the classic Alessi CQC-S holster is probably the pinnacle of easy on, easy off belt slides. Unfortunately, I've never seen anything similar made of kydex.
It seems like (some of) the genius of the CQC-S is that the snaps go under the belt instead of over it. Therefore, the flaps face upward, which prevents them from unsnapping when sitting and avoids the shirt tail from snagging on the draw.
I've been using a Raven Perun with QMS kit. But like other designs, the snap loops face the wrong way (down).
Is anyone aware of a kydex rig with snap loops like the CQC-S?