We just ate at Kona a couple weeks ago and it was very quick...maybe got out of there in about 30 - 40 minutes. I do think you will get to the park around nine, no problem.
So, take a taxi to the Poly and then bus to EPCOT...should work out fine.
ETA: The food was great at Kona. The pressed coffee was really good as was the Lilikoi juice. I had the poached eggs with ham hash...yum! I posted a few pics on the food porn thread if you haven't seen them.