One of the first items I sold at OneSwitch was an adapted Electronic Dice for switch access. Sadly you can't get those little ElectroDice any more, but the system above looks like a really good alternative.
They can get people of a wide range of abilities playing games together, such as Snakes and Ladders to Adventure Game Books. They can also be used to help people make their own random choices in art and music creation.
The style of electronic dice above comes with either a removable or sliding cover, and you can change how many dice go into it. You can get these on eBay (search for "Automatic Dice Cup") for £8.21 at the moment and elsewhere too.
If you'd like to know more, I recommend contacting Sen-Sation.co.uk who created the video above. Alternatively, I'm happy to look at adapting one for you. If interested feel free to get in touch.