Could be done, though, with a screw driver(probably philips head) and about 10 minutes, maybe less with two people?
No doubt.
The hatch over Amelia's head would work better than the window, and if they could pass notes from front to back through the bulkhead they probably could figure out a way to pass most anything, although a little tight?
Our imaginations do not work the same way, Bob.
Yes, on the ground, it would be a piece of cake to snake a hose down through the pilot's hatch and into the fueling area.
Now imagine FINDING the rendezvous point over the Pacific (not a trivial task).
Now imagine the PBY dropping a hose out of its belly for Fred to catch while standing up in the slipstream. His life depends upon it. The PBY operator has no control over where the hose goes. The pilot has to fly a straight line. Amelia has to approach the hose without being able to see it directly, because it has to clear her circular antenna, which stands in front of the pilot hatch where Fred is being hammered by the slipstream. Fred can't give her handsigns, because he is reaching up for the hose. He can't talk to her because the radio system is not wired so that he can take a headset up through the hatch.
I am a believer. I believe in miracles. I do not believe everything I hear, nor do I think the Lord on high would provide hosts of angels to make this system work. And I don't believe the military would sign on to the task, either. The quality of military judgment varies, of course, but I don't think this kind of scheme would appeal to those whose skills would be needed for it, no matter how close the beneficiary was to the Commander in Chief.