Totally can be done. I think one of the members here has a diagram for a very basic bike circuit. Honestly, there isn't too much to these bikes and the original wiring diagram is fairly straightforward. Do you have a copy of the shop manual? If not shoot me either a PM or an email and I'll send you the PDF.
I'm currently in process of rewiring a 1979 triumph spitfire and that truly is a nightmare.
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