Why not just use the original A500 keyboard with an extended cable and make a nice matching casing for it? That's what I would do in your situation. Or embed it in the table somehow. Much nicer with original keyboard, imho.
I've discovered that the cable can't be very long (I bought a new A1200 motherboard because my keyboards stopped working with the old one, now it turns out my keyboard cable was 20-30cm too long, so I might start building my own fancy case :-)
Picture frame A1200, wall mounted, is my idea. Using the new motherboard, and putting the old one back in the E/Box tower :-)
