Sorry if I missed it, did you try with your xFD?
( I know you have to consider the CCTV ) but you don’t have to do it all in one go.
I would break the reader down into sections, and “attacks” down to days if needed.
Approach with xFD in hand, “Attack” the top edge, then genuine swipe in.
Next time or at another reader, “Attack” right hand edge, the genuine swipe, continue until you have covered all possibilities.
If you need to, grab a blank card to cover your attack (xFD taped to the edge) then face palm " oh, wrong card " grab out proper card etc.
What sort of HID reader(s) are they? can you see a model number or snap some photos to share.
Somebody here may be able to give you some feedback on them…