There is a charity working solely for helping children avoid the risks of RSI it’s called the Body Action Campaign, I was involved with it in the early stages but had to step down because my RSI didn’t let me do enough to help. If you want to speak/email speak to the founder Bunny Martin, you can get to her at firstname.lastname@example.org.
Bunny is an expert in treating RSI with remedial massage etc and is based in London, she has her own company back to back which does consultations for companies in how to set up their offices to minimise the problem. I’m not pushing her company but feel it is essential to understand that she knows what she is talking about. Get in contact with her and I’m sure she will be more than willing to give you some helpful information.