Hear me out here.
Retraining the Adopted Ancestry general feat.
To keep things exciting we'll start by making it canonically viable from a character standpoint. Pick your favorite racially diverse settlement for your starting point and make sure you have contact to such. Establish in writing a backstory that your character has been through a vast series of parents and/or there is actually a foster system in the given settlement. Either that or you take the "Hollyhock Manheim-Mannheim-Guerrero-Robinson-Zilberschlag-Hsung-Fonzerelli-McQuack" route and have a series of adoptees all in a polyamorous relationship.
How about them rules?
Some abilities can be difficult or impossible to retrain (for instance, a sorcerer can retrain her bloodline only in extraordinary circumstances).
Now that we're canonically viable, have no fear from this clause, you can retrain any non-heritage feat given "about a week".
Now I'm not saying you should be able to throw yourself through the pathfinder foster system all willy-nilly whenever without establishing a reason but as long as your character is either convincing enough or already established to have highly diverse familial background I feel like it's entirely feasible to swap the feat, dirty though it may feel.
Uh, you can't retrain a feat that another feat relies on?
*Looks at the books*
Huh, that requirement only applies to dedication feats. That's weird.
Yeah, not sure it makes a lot of sense for a number of feats to be re-trainable in a general intuitive sense. Don't get me wrong mechanically (especially in a playtest) I love it. Regrettably it's just sometimes things like this come up and it feels real weird.