To each his own...I think its a pretty smart idea, personally, but of course not everybody is going to agree. Where did you get the kit? Do you have a link?
As for the switch: I would use the smallest one possible. Ditch the toggle switch and go for the flush one. Depending on how big it is, I would say mount it somewhere on the black plastics, around the gauges if it looks out of the way and tasteful. Otherwise, just put it in the back under the cowl/seat, or maybe look into some other switches to fit your taste and location on your bike. They are pretty cheap and there is a lot of different kinds and types. Just my 2cents...