We tried this for 2-3 pulls, problem is doll nearly always takes one of the other two healer, and as you can't take two totems in a row, we either "lose" totems (bad), or I had to heal in the other world but it's really infective as I couldn't buff the other two dps efficiently (bad too ), so I switched back to heal. Also EB does proc conductivity, and UF doesn't seem to give any "healing" benefit, so I'd say EB is the clear winner if you're trying a conductivity spec.And conductivity is a great alternative if you want to run with 2 healers only and want to turn yourself into a healing hybrid (but should be done in combination with unleashed fury imo)
Also I agree that the dps requirement seem quite insane, but the buff helps a lot once you manage to always stack both dps at 25%, and healer/tanks definitely must assist dps through the fight (asking our feral dps druid to use his tank spec (with HotW) to replace our dk helped a lot, our resto drood took Hotw too, and I used EB nearly on cd as a healer (and stormlash+fire elemental make non-negligible damage)), and we went in ~20pull from "wiping to enrage at 24% with everyone alive" to "killing it 2sec before enrage"