it could work. I cant say definitively, as you've got a lot further with your melee team than i have with my lowbie rogues (Tried setting up RAF accounts but blizzard wouldn't let them be activated for some unknown reason)..

So long as you can get them all on target - which interact with target does nicely - I think the healer driving could work.

Some nice macroing where warriors intervene (is this available in all specs?) or charge the melee that's on you i think it could be possible.

Keep us posted on how it works out - i'd quite like to try doing the same with a druid healer (which would be even more mobile than the shaman, and can stealth to0).