Okay, the Orbit Flow 40 sounds like the exact display I've wanted. No keyboard, piezo cells, 8 dots, cursor keys, thumb keys, USB, no extra notetaker features. However, because of the cells, I know it'll be insanely expensive. https://www.orbitresearch.com/product/orbit-flow-40/

Edit: I said originally that this has bluetooth as well as USB. It does not.

Orbit Flow 40

A compact 40 cell braille display designed for smooth, comfortable braille reading  The Orbit Flow 40 is a compact 40 cell braille display designed for computer and smartphone users who want a smooth and natural braille reading experience. Featuring high quality piezo braille cells, ergonomic

Orbit Research
@alexhall I wonder if you could plug a Bluetooth adapter into the USB-C port…