Dragged my Pannier out of its box this afternoon to see if anything could be done about pulling the wheels out from a back to back of 39.5mm to a more ScaleOne32 size of 42.25 mm.
In short the answer is yes, nothing more complicated than dropping the wheels sets out, cutting a small slot into a thick M8 washer and using said washer to spread the load onto the back of the wheel as its pulled out.
Alas, the good news pretty much finishes there! At the new b2b, the front face of the wheels hit the brake pullrods, the brake shoes sit against the wheel flanges, the pickups are miles away from the wheel backs and the combined width of the wheelsets is so large that they only just fit into the cutouts in the footplate. You could live with the footplate issue by limiting the sideplay to a maximum of 1mm, but I need a little more than that with 9' radius curves in the garden. There is a bit of positive light in that the splashers could actually have backs to them at the new b2b which would look a lot better.
The chassis is unfortunately soldered together, so despite the initial promise of being able to pack out the bolted spacers, jacking the frames apart by the same amount that the b2b has increased by involves a complete strip down and paint job.
At this point, I am drifting a long way from the hoped for easy solution, and I've currently got a Pannier with mis-matched wheels sets which isn't going anywhere!
View attachment 7372
The obvious, if expensive, fix is to get new wheels with a width much closer to scale, rather than the 6mm that the current ones are. This would solve all of the clearance issues (perhaps bar the brake shoes, but small job to tweek out) and only leaves the pick up issue which I need to deal with anyway.
At least I've managed to answer my question, 'Is there an easy and cheap way of getting the Pannier to ScaleOne32 standards (ignoring wheel width and flange profile' - No. Bugger.