I've been looking for something like this for a while. No idea if it's worth a damn but it's exactly what I've wanted to convert a few standard pals based pouches into tear-aways.

Thought I'd pass it along.

Maxpedition Tear Away Modular Panel





Allows user to quickly remove a pouch from his vest/pack
Contains five (5) rows and three (3) columns of PALS webbing
Detaches and re-attaches quickly with hook and loop
Square 5 x 5 footprint allows pouch positioning in any of 4 orientations
Removable 1 retention strap with buckle provides added security when desired
Oversized pull handle for easy access even with gloved hands
MOLLE compatible
Attach using two 5” TacTie™ Attachment Straps