Thank you for the suggestions.
The PCIe expansion would be via a Thunderbolt expansion box (the Sonnet). Granted it is Thunderbolt 1, but 10Gbps will still allow the card to run at full speed. You are correct in that I don't need to buy anything give it a whirl. I have this
https://www.unibrain.com/products/cat-5-repeater-400/ Firewire extender as well which would allow me to test option A just using the Firewire port on the Saffire Pro 40 in place of ADAT. My only concern was latency. I will try it out before buying the RayDAT.
I will dig into the X32 OSC options as well. Thanks again for the ideas.