May I ask why so intent on using the Martial Training stuff? I get that you like it or something, but I do wonder why you seem so intent on bringing it in.

I don't mind that specific instance of third party materials for the Kistune. I always felt they could use a bit more customization options.

Do be aware however that a Race Trait is different from a racial trait. Just because you chose Teifling with Racial Heritage Kitsune doesn't mean I'm going to let you replace the Tiefling's spell-like ability for Natural Finesse. But I also don't know what your end game is, so just consider this a mention.