Honestly grabbing this just for the pyro buff, I'd adopt this mod even with just that alone. I love that idea so much, it makes a weird type of sense and would help make them legitimately useful in a manner of speaking.

I really like how simple this is, and the effect it has on realism surrounding fire extinguishing of self

This will work for them, because this is related to "extinguish self" job.
"Fleeing fire" mental state is it's own thing and will work normally.

What will happen for the pyrophobic sanguophages?