Caps Lock as Ctrl will serve most Emacs users for quite a long time, and it's traditionally where the key was before IBM in their infinite wisdom moved it in 1986.
Then don't contort. As I mentioned in another comment, insisting on keeping your fingers on the home keys is a bad idea. You should never bend the wrist while typing. When I want to hit the Ctrl key, I move my whole arm down and to the left so that my pinky (or any other finger) is over the Ctrl key. Moving your whole arm is what is recommended.
BTW, I'm not against remapping to the Caps Lock key at all - I grew up on those keyboards as well. I am merely dismayed that it is the first advice given, when it is fairly minor in preventing RSI.
FWIW: if you are RSI prone, you to be minimizing time spent on a keyboard in the first place, and heavy editor use is probably just a bad idea in general.
And before you say I'd be faster with a typical home row setup, I program fast enough to compete with the best in the world in competitions, editor and keyboard enthusiasts talks a lot but they don't really deliver that extra speed in practice. They optimise for one use case and ignore the others, so they don't get faster overall.
I lost the speed because I wasn't doing as much documentation as I used to with qwerty. For development, that loss of speed hasn't made any difference because I type just as fast for development purposes.
But my main point is the people I know have not optimised things for speed, they have done it for comfort. A ten hour trip in a plane takes the same time in business class as it does in economy but one is a nicer way to travel.
I wouldnt run out and tell everyone to change their setup, people are usually driven to it for one reason or another, either just curious or have an issue they need to address but on a topic of ergonomics, thats exactly what ergo keyboards are about.I'm of the opinion if you're regularly pressing keys on the keyboard without using the tips of your fingers and/or thumbs you're doing it wrong.