Has anyone looked at making one of these accessible via Scratch? I know it's not valid for the competition, but trying to find an easier way in for some KS1 children.
I assume it just needs some form of Remote Sensor Protocol extension writing..?
Correct, that is all you would need to do. Then it would be a case of sending broadcast messages from Scratch which are then matched in the python and forwarded to the relevant part of the Astro Pi module.