Thank you for posting this workaround!
I work at a PBS station where we take in completed programs, do some minor editing (lower thirds) then export back out. The CC has been cropped out on ingest.
Capturing uncompressed preserves the CC, although in our tests when we export back out to a Beta tape, the CC moves down a line, down to line 22.
To fix this we move the video up one line. (motion tab, center, change y to -1).