FCP does not need anything to read BWF timestamps.
If you don't see a start TC, it's not there.
AFAIK, the BWF part of the Zoom is one big marketing hoax, as it has no external reference.
However, i'm able to convert the file creation date to a proper BWF stamp.
(I could alter QTchange to add the functionality).
But, you will still be off by a few seconds. (Although it is of course better than nothing.)
Do send me a testclip to have a look at! (contact me direct for my dropbox)
hth
Bouke
www.videotoolshed.com