So… my wrists.
I ended up just changing my lifestyle, and that went a long way to healing my wrists. I type a whole lot, but on keyboards that fit me, and with a decent posture for prolonged writing sessions.
Hilariously, I recently purchased, um, “Wacom technology”, via a Galaxy Tab S6 Lite. And I use the “S Pen” that comes with the device, which works fine in LineageOS, and is really interesting to use. I don’t like it is a proprietary technology, it means I can’t trust it because a company holds the sole interest of the tech. But it isn’t ergonomically poor, it works quite well.
If I were loyal to brands I’d probably grab the Lamy EMR pen (EMR technology | Lamy). On the other hand… what if I confused it with my Lamy ink pens?! 
That think is a tank, and I still have it. It became part of my IT toolkit: USB keyboards are very useful when dealing with hardware from the last decade. And I’m not worried about it breaking, it’s that kinda rugged.