Ah, it was not clear to me from your post that you were including solenoids.
The dash locker lights are tied into either the stock locker switch outputs or the PCM, not sure which. Not sure if the indicator switches at the axle carriers will indicate on the dash without the locker switch being engaged? Might be best to test that.
Sucks about the pumps being unobtanium. In that case I would do like I described above:
ARB pump wired in under the hood running at it's standard high pressure with its own switch
Plumb that to a regulator
Run line from regulator to the approximate location of the stock pumps behind the transfer case
Wire air solenoids off of the stock pump wiring (I have done this on the rear of my TJ Rubicon)
plumb lines from solenoids to axles
you would have 2 switches: A compressor switch and the stock locker switch which would function like stock as long as the compressor is on.
Your dash lights should work like stock.
Edit: there may be a way to tap into the stock locker switch to activate the ARB compressor in my proposed setup but my head is already hurting