It's unfortunate it doesn't act like it's cousin ShelteringWell I posted to try and save myself the effort.
But not happening, so I went to a server I haven't been to in years and brushed the cobwebs off my crafter.
Results are:
Diversion on cloak = reduces melee threat only
Diversion on Crossbow = reduces melee threat only
Thanks to all for joining me on this thrilling journey of discovery.