As someone who has suffered considerable wrist pain in the past, I would suggest you check out the works of Pete Egoscue, whose exercise methods were a lifesaver for me.
If you are in as bad a shape as I was, you'll likely have to spend many hours a week to recover, but I've found maintenance to be much easier; many months I don't even spend an hour on it, even though I spend even more time on my keyboard than ever. (But the initial recovery process was hellish, I don't mind telling you. Mostly because I hated spending so much time on the exercises, but also because of the existing pain and fear of pain on my part.)
Even so, given the choice between even the best voice recognition and being able to type without pain, I choose the latter.
What sort of hours are you logging on your keyboard these days? It looks like Mr. Egoscue has quite a catalog, could I impose on you to narrow down which books you found helpful, please? I live in South Korea, so getting a non-kindle book shipped over the ocean is a non-trivial undertaking.
I'm thinking about writing a more substantive post about how humans work and how we can work better, a little like this one. As is common with these sorts of things, once I started to do research and pull on various threads, it turned out that the field was pretty deep and would require time to understand. But in the meantime, I just thought I would link to this video of someone programming using only their voice.
As I suffer with symptoms of carpal tunnel syndrome, this is of particular interest to me. Once I watched it I decided to start looking at different voice recognition software so that I could still get some work done while typing less. I'm happy to say that even the default software for speech recognition which came with windows is actually very able and accurate. I dictated almost this entire post using that software.
As far as I can tell, Dragon Naturally Speaking is the gold standard in voice recognition software. It does come with a pretty hefty price tag, but it may be worth it if you have serious repetitive stress injuries, or as a preventative measure if you're someone who spends a lot of time at their computer. And if that doesn't work, chances are good your computer has adequate software pre-installed.