I'm still leaning toward the starter (ignition) switch. Not all possible symptoms are always present when one of these fails. Of course, the headlamp switch must also be somewhere on the list of possibilities, but this is pretty easily ruled out using a DMM and checking for continuity at all the various positions. There are no relays for the headlamps, just the foglamps, so not a possibility.
If it were me, I'd start by checking the headlamp switch with a DMM and if that passes, concentrate on the starter switch.
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