This is a script based in the one that Mutant Bob wrote in BlenderStackExchange here, in request to a question of mine (aka he did the hard code). Thank him!
– Changes (pose) bone rotation mode
– Converts keyframes from one rotation mode to another:
– Creates fcurves/keyframes in target rotation mode
– Deletes previous fcurves/keyframes.
– Converts multiple bones
– Converts multiple Actions