Hear me out. About 30 years ago, a friend and I were trying to come up with a plan to produce Irish R-2-R rolling stock, but considered the market for Irish 00 trains to be too small at that time. So one idea we had was to reverse the wheel and produce locos with their shells swapped. So a British loco could be put on an A or C class chassis or that some of the coaches could be sold in UK liveries (Mk2s etc) into the UK market to finance the production of the Irish models. It was one of these 'closing time at the pub' ideas, and never really went much further as our knowledge of the prototypes was not in depth enough. We also were looking into an Athearn style drive to make the performance superior to the Ringfield/Pancake motors which dominated UK models at the time. Also the coaches would have flush glazing which was also not a thing at the time.
Thinking about it again the other day, got me wondering if the chassis of any Irish locos, DMUs and so on could have been sold in to the UK market with the 'export' shell or repaint?