Got it, thank you. I was able to take off the windscreen and do an adjustment, but on the fly would be nice. Since the screwdriver must be Horizontal to adjust the up and down position of the headlight, I could not see how drilling a hole in the windshield ( which is directly over the adjustment screw not behind the head as it is driven from the rear pointing forward) would be much use. I was able to stick a boxed end racheting 10 mm wrench and do the adjustment.
If I was to drive it with a screwdriver it would have to be a 1 inch stubby since it is very close to the back of the instrument panel.
PPPSSS--- I have a Gen 2 KLR 2009 model, I see you have an 87 model. that may make all the difference. thanks Dennis