The pebble index seems like the optimal form for this.
https://repebble.com/index
Could be pressed even if your hands were busy.
If you want to relax some constraints, I made something similar for $10: https://www.stavros.io/posts/i-made-a-voice-note-taker/
alt Hacker News
If you want to relax some constraints, I made something similar for $10: https://www.stavros.io/posts/i-made-a-voice-note-taker/