Looking for a logic expert for hire (will pay $$)

[jancivil]

Oh, Ok. So you want Compressor to be integrated as it is with FCPX only in the other direction from Logic. I don't know. The marketing blurb from Apple wrote of integration with Motion and FCPX, no mention of with Logic.

[EdgarRothermich]

One question - How do I replace the imported movie's audio track with my output from Logic? I have compressor, but I haven't figured out how to replace the audio track.

If I use Logic's Export audio to Movie function it creates a massive file, so that's a no-go.

Pay attention to the extra dialog the opens when you export to movie. There you can select what Output Tracks you want embed in the movie file.
Of course, as a standard scoring workflow, you would import the audio track from the video file (i.e. dialog), have that as a separate audio track in Logic and mix it with your score and bounce it to the new video (with or without it determined by Logic's Mute button). On the Export to Movie you just make sure that you have the original audio track of the move file disabled.