So, I started searching for a replacement. My criteria were that the new mouse should be ergonomic, large and wired. I scoured the review sites, shopping sites, the whole shebang.
I couldn't find a single mouse that fits all the criteria. Hence the question.
P.S.
1. I eventually bought a wireless mouse, an ASUS MW203. It is reasonably large and it has helped reduce my pain a lot. But sadly, I couldn't get my hands on it's mythical wired version.
2. It is surprisingly hard to find a large mouse in the sea of compact and portable (read: small) ones.
3. I prefer going wired when it comes to electronics and stuff. They are easy to repair and disengage (you just have to pull the wire). It is just a preference and not a crusade against wireless devices.
It sounds like we have similar preferences, my perspective is that they basically stopped making usable mice and keyboards 20 years ago, and nearly everything since then (especially via regular retail channels) has stupid gimmicks like extra programmable buttons, wireless, lights, is way too small ("laptop"), flimsy build, etc.
One of my favorites is the Microsoft Wheel Mouse Optical:
https://www.amazon.com/Microsoft-D66-00029-Wheel-Mouse-Optic...
It does come in USB too, and various colors. Although the model is 20 years old or something, you can still get them occaisionally on Amazon, ebay, etc as new old stock, OEM versions, etc. Whenever I see some, I grab a few to keep me going for the next few years.
I'm personally quite used to the Logitech shape so my last purchase was a G502 Hero - but other brands and models might work better for other people.