I didn't mean to suggest you were trying to game the system at all. What you asked is a legitimate question, and I can certainly see the logic behind it. It just seems like a stretch to me.
What I could see as a possible extension that is less of a stretch would be to allow a single measurement of an existing course to give a new year 10-year life even if it hasn't expired yet. This would have a similar simplicity of the current expired course exception. After doing that, an adjustment could be made, and then there would be an adjusted course with a new 10-year life. You may say that this is essentially the same thing, but I see one big difference. That one measurement that is being made is of a very well defined and documented course. I still think this would need to be an agreed upon rule change, but it seems more likely.