Mostly, everyone else switches to Isboxer (THIS IS NOT A PAID ENDORSEMENT). Compared to the other costs of multiboxing the innerspace sub is negligible.

Are you trying to use this for healing in dungeons or just the two toons? Is healing surge the only heal you have? I'd probably do a manual bar swap between a time controlled heal (like a hot, not sure if you still have earth shield) and the lightning bolts, to make some of the healing passive and forgettable