After posting on Backpacking Light I was referred to this site
http://www.outdoortrailgear.com/cottage-industries/mountaingoatgear/detachable-mesh-pockets-for-backpacks/
Katharina Pierini makes these and charged me $22 shipped with my custom specs on size. Below are several pictures showing the pocket she made attached to my Jam. This is prior to removing the existing outside pocket.
As you can see from the pictures the pocket attaches using provided shock cord run through existing buckle loops already on the Jam and provides very secure attachment
Ultimately the mesh pocket is easier to store/retrieve things that I need quick access to during the day (map/compass, snacks, water treatment), gives me a way to quickly dry out wet clothing and will save several ounces once I remove the existing pocket including it's zipper.

