The way I did it is with David King, (or anybody else that has the perk No Mithers.)
I used the perks: No Mither, We'll Make It, Empathy and Urban Evasion.
The trick is to focus on unhooking players and run with them to heal them. and just watch the aura's of injured players and run towards them. if done good, you'll get a few healings per match.
At the moment it's a bit tedious cause a lot of killers use The Plague now and it's very hard to heal players.