Sometimes you need some good old fashioned bad movie tropes in your pathfinder!
Gun Barrel Cauterize Feat 2
Gunslinger Fire Healing
Trigger You or an ally within reach takes damage.
With a flourish, you fire you gun and snap the still burning barrel to an injury. The target heals 1d6+ your level. This healing can prevent an ally from falling unconscious and gaining the wounded condition from being reduced to zero hit points. The target is then temporarily immune to your gun barrel cauterize for 1 day.