How about a bunch of combo feats? What do you think?
Master of War
Benefit-You can change martial path features from several different paths, but you may change features between the different ones.
Druid of the Many Circles
Benefit-You can change druid circle class features with different class features. You do not gain the benefit of a second circle feature, but you may change features between the different ones.
Master of the All Arcane
Benefit-You can change Arcane Tradition features with your current arcane tradition. You do not gain the benefit of a second Arcane Tradition, but you may change features between the different ones.
Traveler of the Many Temples
Benefit-You can change Monastic Traditions with your current Monastic Tradition. You do not gain the benefit of a second Monastic Tradition, but you my change different features between the Monastic Traditions.
Throat Punch Games 