I don't think you named one nice looking car as a competitor for the Fit. I could definitly see Honda owning the competition with it in North America. Of course, thats my own opinion I guess, and it may be biased, but really, the only competitor that you listed that did any good in this market is the Ford Focus, and I think a lot of people are getting sick of them as it is.
When you do the conversion, make sure not to touch the glass on the bulb. Don't know how true this is, only mindless chat at work, but a friend was telling me that the finger prints you leave on them does something when the bulb heats up to the high levels it does, and it can cause them to crack or explode or something. I can account for the high heat, my Xenon hyper whites melt the ice off my head lights, and I can even feel the heat come off them with my hand a couple inches in front of them.
Love the idea of removing the grill, especially if your talking about that plastic think they screw in to cover the hole. Make sure to replace it with something like a painted black wired mesh, just to help keep leaves and other debris from getting up under your front bumper. In one of my older cars, I once thought I missed a squirrel, only to drive home and find out I had him lodged in an opening in my front grill, feet first, head sticking out for some odd reason.