It really takes time and a balance and reduction of activities for the best chance of success.

You might pick up Sharon Butlers RSI book at the library, she explains so clearly about fascia, and her "bank account" theory for uses while healing is very good, she has very good gentle stretching plans included for all RSIs and TOS. She has a website also.

Is his posture and ergonomics being addressed as well?

If he feels he must keep working would a voice recognition program be of help? I think they have professional versions for various needs, legal or medical terminology etc.