Is the s2000 housing a bi-xenon projector? Wouldn't it also be a bit large for the 919 housing? Years ago I went with a 35W kit from ddmtuning which worked pretty well and was compact. You could probably pick up a smaller kit from theretrofitsource or some other place.
It's going to be a lot of work to retrofit a projector housing. I tried on my first 919 and used a headlight from a ltr450 since the 919 didn't fit. Eventually I went to a 2004 599 headlight which provided excellent performance better than the HIDs even using a halogen bulb. I also did a bi-xenon projector retrofit on my cbr600rr using a kit from TRS which performed very well. It was a ton of work though and on my current 919 I just went with an off the shelf LED projector headlight which puts out great light and was almost plug and play.
Good luck and post up if you need help.
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2012 Yamaha Super Tenere
2001 Honda Blackbird
2007 Honda 919
49/50 visited on two wheels. 1 more to go!