Then think outside the box.
Have a machinist notch the inside lip of the rotor with the same number of notches as on the stock ring and mount the sensor with a weld on bracket on the upper knuckle. That's good for the front.
Now for those of us changing out the rear axle too, then we're kind of hosed. Especially with a non-selectable locker. But if you were to use a selectable locker (ARB, E-Locker, OX Locker, et cetera), then you could do the same trick with the drum as well. Just weld a bracket on the top portion of the backing plate, close enough to mount the sensor just the right space from drum notches, and go from there.
I'll be spooled in the rear, so antilock in the rear would be useless.