This is not a direct TW interface, but I highly recommend “Just Press Record” — an app that can actually appear as a simple red dot complication on your watchface. Touch it just once, and it’s already in record mode (touch it again to stop recording). On your phone or even macOS you can access both the audio and an automatic transcription for all notes entered this way.
This means I can generate reminders or notes with zero interface friction, even while stopped at an intersection or walking the dog.
I still need a work flow to comb through this “inbox” of notes and decide what to do with them. But usually when I’m out in the world and wanting to get something down via my watch, the process is very off-the-cuff anyway, and further editorial decision-making will be needed before I’d want to commit to whether and how this idea or information belongs in a tiddler.