I also have an occasional need for a solid single Ethernet client WiFi bridge, but all the ones I've found so far (purpose-built and travel routers) suffer from unusable, unstable pathologies.
C'mon HN, these can't be unique use-cases.
- Get a PC Engines 4x 1gbit APU (like this one: https://www.pcengines.ch/apu4d2.htm)
- Get a PC Engines case (like this one for the board above: https://www.pcengines.ch/case1d4blku.htm, also available in red or blue if that is more your thing)
- And a SD Card which you can use to install Linux or BSD
Then configure the thing however you want.
Will cost you a little bit more than ~100 USD but full freedom (from firmware onwards) is priceless :)
or just a lot of value for the money:
search for N-BOX-S2 in aliexpress like: https://www.aliexpress.com/item/4000893344365.html https://www.aliexpress.com/item/4000738202595.html
I have used that for multiple outdoor and indoor wifi bridge needs.