Oh Dear!....Maybe try mineral oil?
Sending sympathy none the less.
Linda c

One of the forum members (corgilvr) recently shared a forumula which is working fantastically on all my wood products. She also uses it on her soapstone for protection, and it might work on your bone handles as well.

Pour one part Mineral Oil to one part natural Beeswax (shredded) into a pot and heat gently until the wax is dissolved. Rub your counters, wooden utensils, etc. to add a protective coat. It's best applied while warm; darkens the surface somewhat, and I was pleasantly surprised to see water beading up on top of my butcherblock island. I love this stuff. (Thanks Debbie!)

If you decide to try it, would you come back and let us know how it worked for you? I'm getting ready to rub this on my knife handles...