Sorry, no blue point...but maybe...
I think this post did inspire me to finally fab my own 2 curve turnout from a couple extra B.mann 18" roadbed curves just to see how hard it was. I used rail connectors at the point rails pivots. The bar holds the rails in place. The rest hardly applies for you, pretty /scale were not on the agenda, only function, and only 2ft long max. leading to a mine portal.
I'm confident enough now, to no longer hesitate on a "small track" hand build. Losing the roadbed would only make it easier IMO.(if the track doesn't fall apart) It went fairly smoothly and took only a few hours counting the glue drying. (JBw & Gorilla gel super)
Thanks for the inspiration, and I sure hope you get this licked Lee.
Did you consider rebuilding one of the "junkers" over time to a higher standard for future use should one fail?