True, you can't get elephant ivory, but there are several folks who will
recover keyboards with bone.  I believe they use cow horns or similar
non-endangered parts.  I think the early keyboard instrument builders
use these on their reproduction instruments.  Some early instruments
used bone instead of ivory.  It's supposedly looks quite nice.  Cost,
I've heard, is around $1,000.  If anyone has an interest, I could
probably get an address for you.

Philip Jamison