I have used the LW hand climber seat too, but it needs some weight cantilevered on it to hold its position on the tree as it does when you stand on it. Some lock-ons have the same issue as do climbers. Once you go off the platform the base is only biting the tree with its own weight on the cam strap and platform teeth. If you go off the base and push off on from the sides with your feet to maneuver around the tree the base will slip and even drop some. I have tried cinching the base with a ratchet strap, which will keep the base from descending without you, but its still problematic and would take several paragraphs to explain all the scenarios.
I agree hand climber base is an option, but it is far from ideal and is not safe unless you use SRT gear as your tether system girth hitched to the trunk while you ascend. Otherwise if the platform slips either while climbing or when you go off to shoot around the tree you might have to shimmy down the tree with legs and arms, but only after shimming back up enough to get your weight off the tether to disconnect it to then be able to shimmy down. Bad situation to be in unless you are very, very athletic.
I think using a one stick method or a few steps with aiders and mini platform like the predator with SRT gear as your tether is less trouble and about the same weight or just slightly more than the hand climber. The SRT gear makes the whole operation very safe as you can just belay to the ground no matter what happens at the platform level or with your climbing method. You can also reascend on the SRT gear if need be to retrieve any junk remaining up in the tree after a mishap.
If you're already a stick and lock-on user the saddle or a rock climbing harness and tether system alone as a replacement to your fall arrest harness will give you freedom and safety to shoot around the tree like you never experienced. Its a game changer. Further experimenting with steps or modified sticks and aiders, mini-platfrms etc is secondary to the saddle and tether's function on the tree. IMO that is the big deal with saddle hunting, flexibility and safety at hunting height, not overall weight savings with the complete system.