I looked at a similar pressure bleeder, and almost went that way, but I wasn't sure of the cap size, both jeeps are different, and I also have an MG which would use yet a different size.
I use both silicone and regular Dot 3 in different vehicles so that also made it a little more complicated.
Tim I hope you get yours to work. Mine drew air initially, but the thread sealant and low pressure worked. I just open the bleeder 1/4 turn or so.
I also use the thread sealant around the pipe threads on the drain and fill plugs in the transmission, diffs and transfer case. So far it has stopped that tiny bit of lube that manages to get by....