I did a similiar (except for the Pro Tools) set-up where Im running Avid, Decklink Extreme HD and a RED Rocket Card.
So far as so good except for display output from Avid to Decklink.
The Decklink is hooked up to a Flanders.
The Flanders has two SDI inputs.
I would like to avoid using the Nitris DX (Avid I/O box) for SDI.
This way the RED card can use the Flanders along with Decklink.
As far as adding Pro Tools, Ive heard good things to date but wish I can add to your post.
Our Pro Tools Mac Pro is hooked up to a Yamaha DM1000.
Maybe in the future we will put it all on one box.
You have any luck to date on answers? outside of Cow of course 🙂