I was I this position in a 3.5 game. Playing a Druid, had build all planned out, then our cleric dropped out.

DM was giving everyone a regional feat at game start. They let me take spontaneous healer feat (if I put 4ranks into k owl edge religion, which they let me make an in-class skill), so that I could spontaneously convert spells to heals. Saves having to prepare heal spells.

I don't know if this can convert into a pathfinder game. But if DM recognizes that this is less than optimal, this might be an option.