Highly recommend a regular feature phone or a KaiOS phone; the latter still has useful apps, the former doesn't. You can still keep your old smartphone with wifi if something requires a real smartphone, and a bunch of feature phones have a hotspot mode.
My biggest problem is I have to keep my smartphone stowed away somewhere or I just use it instead of the feature phone.
Any recommendations for a feature/kaios phone with a good camera, maps, music streaminf, signal, and yelp or similar? (Without google spyware or a web browser).
I used a Nokia 2720 running KaiOS. It has a Google Maps webapp installed that works well enough - it's not blazing fast, but lets you search with voice or T9 input. It was enough for me.
No Signal or Spotify, but you can transfer songs via USB. Camera is OK for small snapshots of things you want to remember or send via MMS, but nothing more - not good for landscapes or people.
You can root the phone and then you should be able to remove the browser (0). The b-hackers store (1) is a good place to find apps to sideload (there's a Telegram app, for example).
My biggest problem is I have to keep my smartphone stowed away somewhere or I just use it instead of the feature phone.