there have been a few around here looking for those lights and they don't come up often. Yes there are less expensive options such as pulling the lights apart and painting them and painting the grill as well, but if this is the way you wanted to do it then more power to ya.
As far as the hid's go, i know it's not recommended to put them in a stock housing, but these ones seem to do well with them. there is a little shroud around the bulb that provides a good cutoff for them. I have a 35w kit in mine and they work great and don't aim high enough to blind anyone. good luck with finishing your project.
and yes i would also say to sell the chrome ones you have to try to offset the cost of these. i see them go on CL all the time for a decent price.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22