Matt,
Why use MC cable?
1. It's going to have to use MC-HCF (for Health Care Facilities) or some other form of IG cable anyway. The armor of MC cable doesn't meet the requirements for grounding. It's both the insulated ground in conjunction with the armor that's required for grounding path. An additional ground wire (present in the IG cable) is needed for the IG circuit.
2. It's going to have to have a metal box, now that you're using MC cable. Plastic boxes can't be used with MC cable
3. It will require the use of an IG receptacle.
Reno's method is just fine.
