I had vague ideas, a few years ago, of integrating a keyboard into the handlebar of a recumbent tricycle (it would need to not interfere with braking, but there’s a fair bit of leeway left for useful design). Modelling clay had indeed not occurred to me! Nor had I realised how chorded keyboards could hook directly to GPIO pins. If I’d seen this back then, I probably would have gone ahead and prototyped something right away. Alas for this vision (though not alas in general!), I got married instead and my long-distance cycling days are behind me. But I’m still rather tempted to play with this, it looks fun and surprisingly straightforward, even if I can’t immediately see a good practical purpose in my life. Just last week I happened to see a box of epoxy modelling clay and wondered what it would be like to use… though I suspect it might harden too quickly for this.