There are quite a few kits around designed to make dirt bikes road legal that come with all the parts including handle bar switches etc. probably not period looking though. There are also lots of different aftermarket small ones on ebay, some cheap and cheerful others better quality, some of the chrome finish ones are actually quite nice and while being smaller than originals and less obvious on the bike they are very bright and work well in practice. You can get replicas of the originals for the 70's bikes I believe and then you could always get the appropriate handlebar switchgear if you are looking for a sort of OEM, look as opposed to the many custom options out there. LED types might be good, using a lot less current than the old type if charging output is an issue with lights on etc. on an older machine.
I would certainly not want to ride without turn signals/indicators/winkers what ever you want to call them, in today's busy and fast moving traffic you don't really have time for the luxury of taking hands of the controls etc. if you let go of the throttle at lower around town speeds the engine slows you pretty quickly and you stand a good chance of someone running into the back of you. Also after dark it makes a huge difference. Better to flick a switch and have all your hands on the controls as you never know who will be the next idiot trying to kill you. Do most people even understand hand signals now like the turning right done with your left hand as done in the cars of old?
As for the Sc**ter word, I coudn't agree more on the use of such language. I have heard that they are like fat girls, fun until your friends catch you riding one, but other than that there are no words to adequately describe the contempt I hold them in - even saw a guy on one the other day who had fitted forward highway pegs - still struggling to remove the image from my mind