This may not help at all, but these are what I use:
http://www.velocitysquaredstore.com/...f304bbfede12f3
I am not sure if they could possibly make them to adapt to whatever electronic setup you have, but at the very least least I imagine they could make them with a pressure valve(not sure what it would be called, diaphragm maybe?). I had mine made a few months ago and as far as I am concerned, the molded earplug route is a good way to go.
Granted, my job(in a UH-60 daily) doesn't have the concussion type noise that firing weapons do, but the aircraft keeps a pretty constant +100db noise level with at least one main engine running(inside the cockpit).
I would definitely say that hearing protection is pivotal though, because as mentioned above, it never come back. Once the celia(sp?) in the inner is damaged, its like running over a tomato plant with a tractor and trying to get it to stand back up afterwards, it just isn't going to happen.