I have not heard of any members doing that yet. Really don't even know many R380 owners. However, there was a thread started about 6 or 8 posts down about a concern of using an R380 as a trainer to save wear and tear on the R9.
That concern was alleviated in that post.
As far as your idea, if you just can not get any further with your R9 over time with practice, then you may have a valid idea that may just fill your need.
Afterall, what's wrong with buying another Rohrbaugh ?