So if I understand you correctly, you have 1 mic doing all the recording for the drums? You aren't gonna be able to change much. The best you might be able to do is mess with the eq on his drum track on the BR. Other than that there isn't to many options. Perhaps someone knows I trick I don't but you may have to live with how they sound for now. I recommend looking for a mixer and a Drum mic set on Ebay. It'll make a huge huge difference.

What you suggest for the output is what I would do in this case. It won't be ideal but way to use what you got.