I started using the webos port of kodi + jellyfin addon. It was surprisingly easy to install and doesn’t require rooting. Kodi plays all the DV profiles I’ve tried. Only issue was a slight audio delay, but once I dialed that in it has worked flawlessly ever since.
AFAIK the ad/spyware wasn’t BIOS level, it was “only” bundled with the preinstalled windows. Also, while it doesn’t exonerate lenovo, the spyware doesn’t exist anymore.