Good to see Kirk make a replacement foot athough it is not available in the UK yet. I have doubts about the Kirk though due to my experience with their 500 PF replacement.
I have one of the Kirk replacement feet for my Nikon 500 PF and it doesn't really work on my Monopod with the Wimberley MonoGimbal head. When you balance the lens the foot is so far forward that there is a large gap with no grip in the head, only about half of the head is gripping the foot. The kirk foot has no back part and the hugh front part is making the forward weight even worse.
Does anybody have experience of using the Kirk LP-70 replacement foot on a Nikon Z 70-200 when using a Wimberley MonoGimbal head? If so does it grip 100% in the head?
Alas Hejnar doesn't seem to have any Z mount feet yet, their design looks better with a back part to the foot.