Well, since you asked and you're a machine/fab shop...
If a machining place came up with a bracket that allowed us ZJ guys to upgrade their front brakes without swapping to WJ knuckles and steering, it would sell like hotcakes. ZJ brakes are pathetic single-piston things, and yet our only upgrade options are 1) WJ knuckle swap, requires some spacer welding, all new steering components from JKS, etc. Tough to do correctly for less than $700 or so, and you lose ABS so it's not great for DDs. 2) is the Vanco brake upgrade, which is a modified knuckle with a Vanco bracket that lets you mount WJ (big) or Cobra (smaller) calipers. Vanco absolutely will not sell the brackets separately, you can only buy them as part of the $1000 upgrade kit with knuckles, calipers, rotors, pads, etc. The knuckle modification is basically grinding off the caliper tabs and drill/tapping two extra holes in the knuckle for the bracket - not exactly rocket science.
Vanco kit:
In Australia there's a kit that uses a similar process to mount Corvette calipers. Probably overkill, WJ ones are more common and work just fine. That kit uses a different bracket again, but only requires the caliper tabs to be removed from the knuckle with no extra drilling/tapping as it uses all 3 hub bolts rather than the Vanco's 2+2.
This page has some good info on it, you can see the brackets in the picture of the kit and in the install photos.
http://go.jeep-xj.info/HowtoFordBAdiscs1.htmSo, yeah. If somebody made a bracket that allowed me to mount WJ calipers on my ZJ knuckle after grinding off the existing caliper mounts, even if I had to drill/tap a couple extra holes in the knuckle, I would buy it tomorrow. Design the caliper spacing for a rotor with matching bolt pattern (say, from a 2003ish Explorer Sport Trac) and it would be a brilliant brake upgrade for the notoriously budget-conscious ZJ community and likely sell like crazy.
That may not be the kind of answer you were looking for, but damnit that's the answer you're getting, haha.