The tanks wouldn't be the problem. Toth and Zorn, Vorgath, and Kephess would be the problems. You only need 1 healer on the tanks, because firebrand hits like a wet noodle even for wet noodle standards.
The other day with my 2nd grp that i do HM ec with, one of the healers forgot to repair after a wipe, and had all of his armour broke and still mange to heal the fight fine (yes he had his implants.ear.oh.mh.relics). I think it would just take some tweaking on position and probably we be done best with an OP healer where they could keep hots rolling on both tanks and be very mobile.