Found these very nice LED indicators from German company Kellermann.  The rear ones are also tail and stop lights so the scrambler will be without a separate tail light which accords with my ‘keep it simple’ build philosophy.
Kellermann sell a number of flasher units that are more like mini-computers with various functions. I have the CR4 – aside form a load independent flasher, it has an alarm with sensitivity control, an engine start switch activated by the brake lever. Apparently 3 quick pumps will start the motor..  and a bunch of other stuff. Should be interesting. We’ll see what happens when I try to wire these gizmo’s together.