>If so, I think I might glob it in places with some hot-melt glue to keep things from falling off the breadboard.
I would use a huge heat shrink tubing over the whole thing. That's how I protect some of my homemade PCB. Future Electronics in Nepean sell Polyolefin ones which are soft. Not sure if they sell wide enough one for your breadboards. The transparent ones are good for inspection.
Hobby stores carry PVC based one for making RC battery packs etc., but they are hard and non-flexible.
As for "logic probe" (a few pages back), you can find "dupont wire" in places that sell electronics parts from China. They have proper 1 pin connectors that goes into the clips and 0.025" square post in connectors.
»dx.com/p/single-port-female-to-f ··· &u=55454
Single Port Female to Female Jumper Wire Set (50-Pack/20CM-Length) for $4.90 US free shipping.