I use a rubber gear tie to hold the seat in place for transport. At hunting height, position your lineman belt right above where you want to hang your platform. Then wrap the gear tie around your LB. You're now hands free. It works great.I am thinking of making a quick bracket that fits the width of the post and will go below the top batwing. Just to hold the platform in place until you get it locked down. Should be cheap enough to leave in a tree that you plan on hunting again and have a few in your pack. This is not load bearing at all, just to free up your hands or chest, etc. I am thinking of a screw in, so that would be a problem for public land ( or is it really?) or maybe putting a spur like point may work too. Then you would only need one. I like the size of XOP and the system of camming it down, I just get annoyed with the balancing act of the initial attachment.
Sent from my Galaxy S8.