I looked into this a while ago, there are a couple of things that put me off.
The startup current required for a dual HID setup may be approaching the limit of the electrical system on the FZ6. Depending on the ballast used, the initial startup current could be anywhere from 80watts to 100watts per HID bulb. This reduces to around 30-40watts once the bulb has warmed up. If you add in heated gloves/jacket, accessories, gps it all adds up.
Using a bi-xenon bulb would probably be the best route as you can switch from low to high beam with no delay.
Another option though may be to put a single HID in the low beam side and a normal halogen in the low/high beam side.
I've done the dual headlight mod on my bike and at the moment I'm just running the standard halogens.
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