I got RSI like 15 years ago. The only thing that's worked for me long term when I'm actually doing coding all day long, is a combination of:
a) a keyboard holder below the desk - something similar to https://kw.pricenacdn.com/files/images/products/original/14/... - I got mine from IKEA a long time ago - unfortunately they discontinued that product - the key thing here is the get the keyboard as close to your legs as possible, i.e. enabling your arms to be purely horizontally oriented while typing - or ideally even sort of downwards-pointing.
I love the MS Natural Keyboards and agree about the durability. I had one of them so long the little nubs on the J and F keys actually wore away and I couldn't place my hands by touch any more. (I scored the two keys with an old soldering iron.)
I've tried the Sculpt keyboard, and just not as good for me. I do use the silver media and other keys along the top quite extensively, plus being a Vim user, the escape key seems to be a bit too dodgy.
As they've been harder to buy, when my last one finally died (which is when I found I don't like the Sculpt that much) I ended up trading fixing someone's printer configuration for their barely used Natural keyboard that had been sitting in a corner for ages as they didn't like it. Going to be very sad when I can't find one any more.
That's awesome that you were able to solve your issues with changes to your equipment. I wish I could do the same. Unfortunately, some of us have tried all types of ergonomic devices, and none of them work, thus the emergence of "alt" input like Talon. That being said, I personally fall back to an ergo keyboard like the one you posted for short bursts as needed, or use a stylus to peck at keys.
a) a keyboard holder below the desk - something similar to https://kw.pricenacdn.com/files/images/products/original/14/... - I got mine from IKEA a long time ago - unfortunately they discontinued that product - the key thing here is the get the keyboard as close to your legs as possible, i.e. enabling your arms to be purely horizontally oriented while typing - or ideally even sort of downwards-pointing.
b) Microsoft Natural Keyboard Pro - manufactured 1999-2001 (e.g. https://mechanicalkeyboardtryout.blogspot.com/2016/03/micros... or http://www.dansdata.com/nkpro.htm) I have two of these; they're very durable. You'll need to wash the key caps in your dishwasher once a year.