Pine64's new PineVox Smart Speaker looks interesting, it runs on Bouffalo Lab's BL606P 64-bit RISC-V SoC. Which is very similar to Ox64 BL808, so it might boot NuttX!
https://www.hackster.io/news/pine64-enters-the-home-automation-sector-with-the-privacy-preserving-pinevox-smart-speaker-ac4d6e014601 I'll ask Pine64 for a Prototype Unit and test it with NuttX. Lup