Okay - found the utility - SoundHack ...
1] Use BWF Splitter to create mono files from BWF Polyfile
2] Use Sebsky Tools to convert mono BWF files into mono QT files that SoundHack can read
3] Use SoundHack to change the header from 48048 to 48000
4] Rerun Sebsky tools to create audio.mov files with metadata
Whew!