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The only watch brand I buy is Casio, nothing smart, nothing for show off, it’s reliable, cheap, and certainly you can change its battery:)

If you go with solar you don't even need to do that. +1 for Casio

The rechargeable batteries still need to be replaced, and it's hard for non-Casio dealers to get them AFAIK.

Best option is a watch with a common battery type (e.g. CR2016) and accessible battery compartment.

They're standard rechargeable batteries in sizes like CTL1616, which are easy to get.

AFAIK they don't need to be replaced on a comparable time frame if the watch regularly gets light.

Exactly!