They are all similar to each other to the point where a non-railfan would likely not be able to tell the difference.
That's true, and it applies equally to the Connie. Letter it for the D&RGW or C&TSR (I know, blasphemy, but we're talking about low-tech and low-budget solutions here) and call it done. I may still have a wood cab around, which would backdate it to the Silverton Northern No. 34. PM me if you want to try that.