I have a 96 SC. The Clutched SAD is a very interesting idea. Clutched off the main pulley and that way at steady cruise it would drop both the Power steering and Alternator.
Micro switch on the gas peddle so that when it is fully released it would kick on and recombinant charge. For coasting adjust a slight amount of slack in the throttle cable so you can keep it disengaged if you want but not feeding it any fuel. Wire the A/C so if it is turned on it overrides and keeps the clutch engage.
I think I read you were contemplating trying to EV through the SADS? Sounds good on paper but the couplers are crap and I think you would be replacing them often. If you plant to do that then I think you would have to put a true driver shaft in with conventional CVs or universals.
Why not get a 4x4 truck transmission and transfer case and EV drive via the front output?
I think it would be possible to use a gear drive case with what is know as a "dual shifter" That would allow you to engage 4x4 (or the electric motor in this case) but get the gear box in the case into neutral to disconnect you from the regular transmission.
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