Yes, you can get through the IG for a PPO ADR. and let me tell you, you are in for a treat! It is amazing! We were staying at The Boardwalk when we had a PPO for Akershus. It was our first time, so we had no idea that something like a PPO ADR would become one of our favorite memories. We left the hotel around 7:30, they let us through the gate at 7:45, and there we were, in the World Showcase, ALONE! I mean, all alone! It was our DD's 8th birthday, and she got to do cartwheels in England and Canada, because she could!

We had a fantastic day, but what we always seem to talk about is when Lucy got to do cartwheels in Epcot!
We are staying at the Contemporary later this year, and we plan to take the MK bus to the Beach Club, just so we can use the IG! It may be crazy to some, but we LOVE the IG, and that is how we like to enter Epcot!
I hope your trip is magical!