I think I've figured out what to do with the u/c, and it's not much. After doing some match-up of parts, I decided to go with the Nimrod wheels, at least there's a De Havilland connection with them (De Havilland Comet/Nimrod).
After working out some parts which would end up a bit complicated, the solution turned out very simple. When the aircraft gets into the air, the wheel truck extends to it's fullest, that's both the oleo and the large hydraulic cylinder which dampens the rear axle, then the oleo is retracted to it's most shortest point while the large cylinder stays at it's most extended. This sort of makes the truck stand vertical so the rear axle is at the bottom and the front axle is at the top. The u/c leg is then rotated forward which makes what was the bottom of the wheel (where it touches the ground), into the top of the wheel up against the underside of the wheel bay top.
All I have to do is move the front axle forward of the oleo about 3mm and everything works the same way, except once the u/c is retracted, the front axle & wheels sit higher in the wheel bay. But I do have to move the u/c leg hinge point back a bit to maintain the load carrying center of the truck. Looking at a Cut-Away drawing, this doesn't pose a problem to move the rear of the wheel bay back a bit in real life and this will create a bit of extra distance between the front of the wheel bay and the edge of the tire which is needed because of the different wheel diameters
So that's another problem out of the way ---
Here's a link to the retraction sequence
https://www.youtube.com/watch?v=31ypGN0iREE