I gave the styrene bits a good try, but in the end, there wasn’t enough material to hold onto with adhesive, and it didn’t work. Fortunately, disassembling the switch was straightforward, and I was able to adopt the better alternative with .01″x.025″x7mm “joint bars” soldered to the either side of the point, and slipped over the end of the closure rail.
The resulting hinge admits zero movement, and near perfect alignment in all directions. Most importantly, another derailment has been resolved. If I find I have to correct more switch heels, I may design a part and have it 3D printed in brass. However, for a one-off, the hand-built solution was relatively quick, and would have been quicker had the tiny pieces of brass been easier to hold onto!
Pembroke:87 