I'd suggest you bite the bullet and just pay a roving glass guy to do it.
Matthew Currie and I spent several HOURS getting a windshield out of his parts heap a couple of years ago. Yes, we knew about the piano wire trick, which did not work. We finally custom ground a couple of hacksaw blades and used them as cutters.
In comparison, when I needed the windshield replaced in the MJ I bought, a rolling glass guy came, had the old window out in about 5 minutes, and the entire job done within 15 or 20 minutes, including writing up the bill. There is no substitute for having the right tools and knowing how to use them
BTW -- the price list for the u-pull junkyard I sometimes visit when near Philadelphia specifies that when you try to pull a windshield, if you break it you buy it anyway. Other u-pulls won't even allow customers to pull windshields -- that ought'a tell you something.