I have heard that you can make the antler less curved by boiling for a while then put in a vise and tighten it a little and lit it cool in the vise. I have done it with some success....
You better start looking for some more antler. Get the word out that you are looking for antler. You will be surprised what you may acquire.
If you would like some tips on acquiring antler, let me know through a pm.