Now I've gone and done it. I took a Plexiglas board originally cut to hold that Arduino, and mounted on it a former proto board, its wearing the sockets that we can plug headers (or jumpers) into and rows of breakaway headers on, and added a small breadboard. I previously stuck a larger breadboard on it.
The idea was to use it to support the only BS1 device I have who does not have its own project board on it, and use it for development. Then when the program works without too much trouble it would then be used for confirming that it works on the (rare) OEM BS1 I have here.
As it happens I do have one of those fellows, it was sold to me by one of our members last year.
I'll have two photos up shortly. Watch this space!