I agree. Why not implant a plastic jaw bone? It might not function much, but it would restore some structure. Reconstructive surgery has done far more with far less.
My wife had bone cancer of the jaw. The surgeons removed over 50% of her jaw and put in a temporary titanium structure that looked a lot like strap metal.
A year later, they removed a bone from her lower leg and refashioned a new jawbone and last year she received dental implants to regain some chewing on that side of her mouth.
She will never be the same again, but every day I am thankful for how God and skilled doctors restored her to a vestige of what she had once been. It has been six years and so far, no return of cancer.