I came up with this by trial and error and seems to work, does this set up and workflow look correct?
1: Animate character or orbject and bake it down to Alembic.abc file. Do not choose bake and delete (r20) if hair has been added before the bake as the hair will not work as the original object would have be deleted in which the hair was added too. If the hair was added on the alembic file after the bake all should be good and proceed to step 2. (assuming hair can be added to Alembic file) Edit Ornatrixcant be added to alembic file.
2: Select the object thats been baked, turn off visibility if you had to choose the bake option without deleting original, and select the path of the alembic file.
3: add Moov operator to the bottom of but above the curves from stands so it will still be rendered. Add the animation operator above the Moov op.
4: In the Animation Op paste in the path you copied from the hidden animation objects ablembic path.
5: Press the Record Animation button.
I noted that it makes no differnce if I use Animatino op or not regarding the baking of hair dynamics, it seems to be baking the abc animation of the object not the dynamics of hair hence the playback is as slow with or without the Animation op in use?
Dan
My Web Site - ArtStation