Jon, warthog is not known for its strentgh and integrity as a "solo" handle material.
The spacer idea is a great one.
As well, you might consider having oval inlays made and put into a handle material that would support hard use.
I do it all the time.
Here are examples of Mother of Pearl and Mammoth Ivory.
Now, consider having your next bow made with inlays to match your knife!