I have to agree with Ozpeter that the s/pdif output requirement is a bit limiting. How about this workflow:
-Buy any handheld recorder, not worrying about s/pdif output
-Copy audio file from recorder's memory card to desktop/laptop computer
-Open file in itunes and burn all relevant audio files to a redbook audio CD
-Insert redbook audio CD into masterlink
and import from disc onto masterlink's hard disc
Kind of a pain, but probably quicker than real time transfers? You could also use a re-writable CD so that you didn't keep wasting discs just for this workflow.