Should be straightforward I'd have thought. At a guess they'll simply need 12V to go up, and when the voltage is removed, they'll go down (is there a spring to pull them down?). Give it a go with a temporary lash-up. If so, just take a wire from the headlight relay to each light.

Re the wipers, I'm going to start a new thread to find out what stalk movements there are (I think it'll be 2 positions - one to get the rear wiper to work, and a second for the rear wash), and if the rear wiper is intermittent or on constantly. Once I know this, I'll be able to come up with a wiring diagram for you.

Question for you : Does your headlight/wiper stalk have the seperate 1/4" push-on earth tag ?