Richard, For one thing, the A7s doesn't have HDSDI trigger or even an SDI output for that matter. And for another thing, I'll only be using the Odyssey for 4K anyway. If I wanted HD, I can do that internally with no external recorder.
From everything I've read I will be able to trigger the Odyssey remotely while it is in the bag via the old fashioned timecode method. Timecode trigger will be good enough, and I didn't mean to give the wrong impression that remotely trigging the Odyssey would be an issue.