haha yeah I can see the Medic perk being at least attempted to be abused but it's a nice idea and I hope it works well. I can see it being pretty balanced though, for instance: The Carbonizer Medic would probably be pretty slow and could greatly hinder the receiver. Plus, there's no way you would keep it out to reload. You'd really want to have a second automatic gun although that may be possible with the current weapon system, I really don't know how that works yet. Also, if you get separated from your team you will not be able to heal your teammates at range.
Overall I think the healing damage should be a tiny bit less than normal damage maybe, but this has been done in Team Fortress 2 and that's a pretty balanced game... Although REALLY different so I guess that doesn't count for much. It seems like a risky thing to include but if HVS can use patches to alter perks then I think it's a great idea.