....15 years later.....
Did you find the workflow?
When I export the animations clips and I load it to my second character I tried to paste it with all the pasting options(name, hierarchy etc). The pasting as ´´node name´´ should work because when I do the Character mapping with ´´node name´´ works straight away but it does not when I do it importing or pasting the clips the clip.
Could you help me? Are you alive guys?