Skip,
I just ordered some of these per the above recommendations so I'm no expert on them yet but I did see one of Mike's and as I remember, it's more of a rope through a rope sort of philosophy. Reminds me more of a "chinese finger" if you've seen one. So unless I'm mistaken, you'd have to make a loop to come back through the acceptance hole which is where you get the cinch factor on the UCR's. Guess you could get a shorter one and just attach to the harness and then put it through a long climing rope that goes down to the ground maybe?
What you're talking about makes more sense, a prussic. You could simply buy some climbing rope in bulk and put a prussic on it to attach your harness caribiner through the prussic loop and slide the prussic up/down with you as you climb. You're concerned with the climb up and down right?
They also make a system that has a spring loaded spool on it that you can put above your treestand. Spendy but that might be the cat's meow because in the event of a fall, you can lower yourself slowly as I understand it. Not sure of a link but a buddy of mine has one and loves it. But for 60 stands, not really in the cards.