There isn't one currently.
Some Kobos can use an external BT Keyboard. But usually only for the annotations, not on the Sage or Elipsa notebooks (they work with handwriting recognition).
The Kindle Keyboard 3 can show Publisher fonts and azw3 ebooks from Amazon. Any S/H ones would need a new battery (done that on two of them). But a S/H might be blacklisted.
Some Android based ereaders like Meebook P78 (updated Boyue Likebook Mars) can take a BT keyboard and install an app like Jota to take notes.
For actually just reading books the Kobo Libra 2, Kobo Sage and I think Kindle Oasis have page turn buttons.
An actual QWERTY keyboard is superflous for reading and I don't bother with BT on my annotations, I just use the touch keyboard (Kobo). Didn't use Kindle for annotations since I got a kobo.
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