I don't know how many times I've mentioned this, but I went through all this window reg crap a little while ago and I found
www.electriclife.com.au (speak to Shaun) to be the best place to source one.
They do reconditioned ones, they'll recon yours if you get it too them for about $170, and they can sell a complete new aftermarket reinforced one for half the price of a new Jeep one.
The way Jeep designed the window regs, it's inevitable that they are going to break one day. So it doesn't make sense too me to put the exact same design back in there only to have it break again one day. The metal cable blocks from pocket logger (as you mentioned) and the aftermarket (Italian designed and built) window reg from Electric Life are the only 2 ways I know of that actually improves the Jeep design to make sure it never happens again.
Also I just remembered, someone else on this forum also had a window reg die on them recently and managed to fashion up a fix himself. If you do a search I'm sure you'll find it and I think he showed pics as well of what he did. So you could check that out and maybe you can do the same to yours...
All the best.