I've thougt about a black A1200. A member of this very site posted a very cool black A1200 incarnation he created.
Anyway I'm still stuck on the keyboard part. CDTV keyboards are pretty rare.
I've got a nice white A1200 (it is almost none yellowed) that I keep under a dustcover. It is only used when no direct sunlight can shine upon it. I hope to keep it white for a couple of more years.
Also I have a spare keyboard (still in the mitsumi factory box) I'm thinking about spraying a yellow A1200 using silk gloss paint. If you hold the spraycan around 30 centimeters from the object you get about the same plastic shine as the original case has. The yellowed keys I can replace. But if those keys turn yellow I'm out of options.