I would definitely try to find somebody with a good multimeter and current clamp so you can accurately measure the draw of the individual items as well as the actual power your stator is making. I just got a new Fluke setup that you can borrow if you can't find anybody local, but it would take a few days to ship over there.
I know your HID is supposed to be 35W but some of them use quite a bit more. And even if 35W is accurate, I doubt that your 100W electrical system will be able to put up with everything at once. 35W HID + 35W main light + 25W or so for the fan (that's what the Spal fan on my KTM draws) + 5W tail light + a few watts for the navigation gear. And don't forget that the ignition of the bike draws quite a bit as well!
It just doesn't add up, so I would definitely make both lights switchable and only run a single one (or none) as default.
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12 690 Enduro-R, 12 Husaberg FE570, 09 KTM XC-F/ 450 RFS hybrid, 07 KTM 450 SMR, 09 BMW F650GS twin/F800GS hybrid, 03+05 YZF-R6