Ways to Get Stunning Fist?

[Inevitability]

I did find that when searching for classes with "Stunning Fist" in their class feature descriptions, but I think that would fall under the same clause that covers Fighter bonus feats, no? Like, the ability doesn't specifically say that I can ignore prerequisites, so I can't.

As far as I know, there's no direct ruling about meeting prerequisites for bonus feats that don't mention them either way? There's bonus feats that specifically say you need to meet the prereqs, and feats that specifically say you don't need to meet them, but I don't remember seeing a rule that says everything defaults one way or another.