I can answer my own question. After a great deal of searching I couldn't find an off-the-shelf 12mm rear axle with a fully integrated quick release lever to replace the standard removable lever set-up. What I did instead was to buy a fat bike 12mm integrated lever QR axle that is way too long...
I have to remove the wheels from my Fuel Exe 3-4 times a week to move it in a small car, so I am wanting to change the standard axle and removable hex key set up to an integral lever type quick release axle for convenience. The standard removable Hex key lever either gets lost on a ride...