I moved your post here to our Spinal forum, it seemed a better fit for your issues.

Have you talked with a surgeon yet to see if any minor /day surgery could fix some of the encroachment issues?

My dad had some bone spurs/calcium deposits causing problems that his surgeon was able to do a day surgery and grind away the worst of it. Just 3 small incisions/holes for the tools to do it.
I'm sure it depends on the exact location where the problem is for each person.