IIRC the game was developed with colour blindness in mind so besides you wanting a yellow health bar, its already made in a way that it shouldn't be a problem.
I remember a dev responded to this question a long time ago in one of the threads.
Correct, we tried to make things red-green colorblind friendly from the start so we didn't need a setting. If anyone who is colorblind is running into visibility problems, I would love to hear what specific areas we could improve.