A project is currently being launched called the TinyNES; A device that plays 8-bit NES cartridges and only outputs composite video. Here’s their main page, with no price or availability announced: https://www.crowdsupply.com/tall-dog-electronics/tinynes
Honestly, I (Bob) don’t really get it. A device like this requires you to cannibalize existing NES or Famicom consoles for their CPU & PPU and the projects that have tried it before deemed that unsustainable. Maybe I’m looking at it from the wrong perspective, but I don’t see this as preservation, or a new way to play. I’d have rather seen more work go into the Opentendo project, or other things that breathe new life into original consoles….just my opinion though.