Do like that. Seems to have the best of both worlds.I dive my pony sidemountish style. Clipped in top and bottom and then bungeed up to the side. For travelling, I use Dive-Rite's 1.5" wide camband (BC 2036-1.5 - Cam Straps - Dive Rite) in a roll-my own stage-strap rig for my 5" bolttles. It is not as secure as the ones I made with jubilee clips/worm clamps but certainly acceptable. Speed and toolless are the real advantages, especially if you will be swapping tanks between dives.
Dive-Rite also has them complete: Travel Stage Strap - Dive Rite