Welcome to the DIS, I do not think this is possible - Disney does not allow walking along the roads at WDW (no sidewalks) and I have not heard of a trail between POR/POFQ and OKW but if there is one, would love to hear about it!
There is a trail, but I would not suggest trying to get there that way. It is thru a construction area and involves crossing the busy Community Drive. I have walked it a few times, but it is just a dirt path and comes out in the PO parking area. It's also about a 20 minute walk- depending where you are at OKW.
I'd suggest taking a bus or boat from DD to get there.