from the poly to the gateway would be a pain in the butt!
You would be better off going from the Poly to the main epcot gate.
The international gateway is a side entrance over between UK and france. You can walk there from the Boardwalk or Beach and Yacht club.
So from the Poly you would have to drive or cab to one of those, then walk to the Int'l Gateway.
hmm maybe i'll just tell them to go through the front gate. Will the disney people freak out if we dont all meet at the international gateway? also, the men will be wearing tuxes, i hope this wont be problem either.
From the poly I think the easiest would be to take a bus to DHS, walk to the friendship boats and then take the boat all the way to the International Gateway.
Or just let your planner know that you will need a guide from the front entrance instead of from the back one.
I was under the impression that one could catch a bus to anywhere on property at the TTC, but I could be wrong...sorry about that. I do know that you can walk from the Poly to the TTC pretty easily.
Essentially, the easiest access point to the International Gateway is from either the Boardwalk or Beach Club.
The question then becomes the best way to get from the Poly to either BW or BC...a bus from MK is probably the simplest. A cab is probably the fastest.
But, there are as many ways to get from point A to point B as there are people!