Pathfinder 2e General Discussion

One of my players is an investigator who has taken the secular medic background. He is enjoying his character, but his one point of problem is that he doesn't have a way to use his intelligence or Lore: Anatomy to roll for treat wounds or battlefield medicine.

I understand the math in PF2e is very tight, so how 'breaking' would it be to give him the chance to take a homebrew feat that is basically the Crystal Healing feat but for Lore: Anatomy or Lore: Surgery? I'm thinking I would call it "Surgical Training"

Thoughts? Am I missing a feat that already does this? Please let me know!