James,
Several, if not most, of us really appreciate your activity on the forums. Your candor and willingness to share what Bryston is ATTEMPTING are welcomed!
I'd be disappointed too if there isn't an upgrade option for my 4BSST-2, but I wouldn't hold it against you. You explained the engineering folks had to make sure it was possible. Check. Now it's the certification stuff. So, Bryston is trying to make it possible. Regardless of the outcome, thanks for sharing and for explaining the process (and hold-ups) along the way.
- Garrett