Amazing work as ever. 
Personally, having fitted auto-dim mirrors in a number of cars over the years I find the "un-dim in reverse" totally irrelevant so ignored it every time, the last being on my PF S8, but serious brownie points for doing it right! 
I guess the nearest reverse signal is the long (red/blue?) wire that runs all the way from (I don't know where) via the F125 then the RNS to the back of the car, so yes hardly convenient. 
As for dimming mirrors being difficult to get, is it the units, wiring (surely you can fix that) or the actual mirrors glass that is the problem?
My current S8 was fitted with them at the factory but by the time I got it had standard external glass. I found a nearside glass fairly easily but my drivers side is actually a US nearside one, complete with inane printed warnings! 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 2nd January 2022 at 08:37 PM.
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