Are you wanting a DDR to do frame accurate insert edits? Good luck. Especially if you want to see pre and post rolls. I’m not sure if the 422 control on the hyperdeck is supposed to be for capture or playback.
EVS in edit/rec works under 422 control (by creating a new clip every time you are in ‘record’ and putting it in the right place in the playlist that is the record tape). Abekas had some solutions that never quite worked.
The interest in this went away with ‘linear’ or ‘tape’ editing… not to say it wouldn’t be useful (eg. if you wanted to fix a typo in an hour long quicktime…).
Mind you editing with the EVS in edit/rec is neither linear nor tape 😉