Mykel, I don't know if they have any Jo-Ann Fabric stores around or close to you, but I took a Blackhawk Enhanced Battle Bag I had to their store about 2 years ago. They have a dept. in the store that is sub-leased out to a sewing machine distributor & usually has at least one or two women there. The one lady sewed on a velcro backing of 6" x 9" on the outside flap of the bag so I would not have to keep opening up the flap to see the plastic map case underneath. She charged me $5.00 to do it plus I had to go get her a can of Coke because she could not leave the dept. to get it . . . .

Now I don't need the map case as much with our GPS, and it is covered in patches. Might check around some of the fabric stores and see if something like this is offered.
Good luck buddy . . .
Be safe.