Additionally, if they do function as would be expected, would having an innate reaction alongside a learned Reaction (like an innate Hamedo effect with a set Weapon Guard) break the whole thing or something equally as unpleasant, or would each Reaction respond appropriately when applicable?
Innate reactions take priority over equipped reactions.
Priority as in it disregards the equipped reaction in lieu of the innate one, or priority as in the innate reaction will attempt to trigger first followed by the equipped reaction second?
I think the equipped reaction will only happen if it has a different trigger from the innate
http://ffhacktics.com/smf/index.php?topic=1288.0
This should tell you everything you need to know.
Thanks very much! :D