Hello, 'dmw244gl'. On all of our 240s, the headlamp wash-wipe worked in conjunction with the windscreen wash-wipe - there was no separate switch.
I'm afraid that I can't help you with your other queries, but I'm sure someone will.
Good luck with recommissioning your car - it looks a very worthwhile project. I think if it were me, I would want to preserve the patina of 40 years - a car is only original once - but I don't know what effect this would have on it's value.
Regards, John.
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Time flies like an arrow, fruit flies like a banana .....
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