Estlor
Explorer
Don't have the Warlord's healing spend surges. She's still limited to 2/encounter.
Doot doo doo.
The artificer's healing mechanic already handles this nicely. You give the ally an infusion with a flat bonus, they choose when to turn it into temp HP as a free action. It doesn't cost them a healing surge. After the combat, everybody sits down and decides who spends the healing surge to recharge the artificer's ability for the next encounter.
The nice thing about the artificer's infusion is turning it into temp HPs is a free action, so you can even choose to do it between getting hit and applying the damage of the hit, letting you toss it to someone you know will get beat on early in the encounter so they can pop it and soak a hit at a time of their choosing.