Ok, so I was thinking... what if we took the Master of Many Styles archetype and broke it down in to the main class?
Basically, all of the Style Feats are added to (instead of replacing) the normal monk bonus feats. You still need to have the style feat (and the Elemental Fist feat, when appropriate) before taking advanced style feats, but you can ignore all other prerequisites (just like how the archetype works). If an archetype changes the monk's available bonus feats (instead of adding to them), then the style feats would be gone as well.
I also plan to change the Stunning Fist ability to be an option between Stunning Fist, Elemental Fist, Punishing Kick, Perfect Strike, and Touch of Serenity. Any archetypes that modify this ability (that is, the ones that normally change Stunning Fist to one of the others) have that change removed (possibly allowing a few more Archetype Combinations).
Lastly, Fuse Style is now a feat;
Prerequisites: Any two Style Feats.
Benefits: You may have one additional Style Feat active at a time, and can enter both stances as a swift action.
Normal: You may only have one stance from a Style Feat active at once. Entering a stance is a swift action.
Special: You may take this feat more than once. Each time, it increases the number of styles you can have active at once, as well as the number of stances you can enter at once, by 1.
Looking for thoughts on whether or not this can be abused in some way I can't see.
Bump and question
Does having Fuse Style as a feat (which opens it up to all classes) make it abuse-able by someone else? I wonder about other classes that use unarmed/natural weapons being able to stack things like Boar Style and Dragon Style...