I'm thinking about running an experiment for which I'd like a special keyboard with about 4 buttons. These would need to act as normal input (preferably keys, like a,b,c,d, or something like that), but they would be a different physical experience. The idea is that I'd like to work with kids and give them a fun (probably larger) keyboard to use.
How hard/possible would this be? I could imagine trying this with an old keyboard, just rewiring it to an external device.
Or maybe there are existing devices out there?
This isn't strictly necessary, but would be better than just putting stickers on an existing keyboard...
Edit: I just realized I could run this on an iPad or something, but I'd prefer physical buttons, and also buttons that are displaced from the target locations (that is, they will see a visual stimulus and be expected to press a certain key; tapping on a screen at the location might give very different results compared to using an external button).