Run a remote adapter onto the place where you normally thread the tank in, and then run macroline to a bottomline ASA. It'll be much more comfortable and fix your o-ring issue. And if you want to make sure you won't blow/eat o-rings, get a on/off ASA with bleed.
Like what I did on my Hammer:
http://i3.photobucket.com/albums/y81..._8905copy1.jpg