You have to be careful here as to the demand for any loco, at the model shop in Glasgow which I have a connection to, sales of the original batch of Clans, both early and late only reached around the fifty mark, and we were not embarrassed by lots of requests when out of stock. The Polmadie Black 5 did not sell in large numbers and indeed a good few are still in stock! We have also not had one single order for the new clan or indeed any orders as yet for the new Scottish A3 (Brown Jack). The prices for these are competitive so not all are going to the "box shifters".
I do find it difficult to see where the need for 5,000 (going on to 9,000) comes from. The NRM did not, i suspect, get 5,000 prototype Deltics or the same number of Truro's. But both of these appeared to be successful for the museum and, of course, Bachmann.
Yes, we should get Societies involved and maybe this is the way forward but I don't think you could ask a small number of Scottish retailers (2 or 3?) to commit to that level. (See comments above re quantities sold of Clans and Balack 5s).
The Caledonian Society some time ago sent round a circular on the subject of getting a Caley engine produced, what happened to that does anyone know.