There is an option not mentioned and that is to use a second computer and interface(a simple 2 in-2 out is fine). Feed a 2-mix from your PT session to the second system and use Zoom, Sessionwire or anything similar to send Take the output of system 2 and patch back to system 1, but be creative with your routing so you don't create a feedback loop. I did this 2 years ago to collaborate with a studio on the west coast and my own in Nashville and it worked quite well
