About the only way to get there, via Disney transportation from AKL, is to take a bus from AKL to MK, then hop on one of the boats at MK heading to FW. The boat may or may not stop at WL on the way. Unfortunately, buses do not go from resort to resort.
The boats are definitely wheelchair-accessible, and they have little ramps they drop at the docks to facilitate rolling better. If the winds are extreme, a CM might be required to help load onto the boat because the boat might not be level with the dock. But I've personally never seen this become necessary.
Once you get to FW, there is a bit of a walk from the boat ramp to the Hoop Dee Doo showhouse, but it seemed to be pretty flat. The showhouse had wheelchair ramps near the front door.