Brilliant work, and a great thing to have for when you can’t or don’t want to have a blade, or as a complement to a separate knife.
You can use the corkscrew as a marlin spike for small knots like boot laces. So if it was me I would keep the reamer sharp, as I find it useful that way. But it depends on what kind of knots you have to deal with, and how much use you would get from the reamer, of course.