The gist of the "safety module" was to prevent starting unless the bike was in Neutral or else the clutch lever was pulled in.
There were a VERY few of the 750K3 bikes that also had a sidestand switch, which lasted less than a month in production in late 1972, and was discontinued so abruptly it never even showed up in the Parts Fiche system. I have only seen 2 of these bikes, ever, and both had removed the switch and bypassed its wiring.
If you want a "safety start" device (and you have a pre-1973 bike), then just get a post-1973 lefthand clutch lever and the little cable and switch that comes with it. Connect one wire of this switch to a BLACK wire under the tank and the other to a small automotive relay, #85 terminal. Connect the #86 terminal to ground (GREEN wire). Then interrupt the Yellow-Red wire that runs from the headlight bucket to the Start Solenoid, using the #30 terminal and the #87a terminal. Then, this relay will always be OPEN when the clutch lever is released, so the Start Solenoid cannot operate: pulling in the clutch will disengage the relay and open the Start circuit. You will find this simple circuit to be 100% more reliable than the cheesy versions included in these bikes in the 1970s, and the relay will cost you less than $10 at an auto parts store.
Or, like mentioned above, just remember to pull in the clutch before starting. All cars, bikes, trucks, tractors, etc., etc., made before 1964 had NO "protective devices" like these, we had to somehow survive by doing it correctly? The bikes didn't have them until Honda started doing it in 1973, then everyone started doing it: by 1980 we were removing the stupid things because they fail and leave you with only a kickstart when the engine stalls in a hot summer intersection, because the carbs got so hot they vapor-locked or flooded the engine from boiling the fuel, inside the Vetter fairing lowers...
