Nate Johnson, one of the devs at LineageOS, maintains some official and unofficial builds. You could go from scratch using a Radxa SBC, or try to get an older streaming device (like one of the previous versions of the Chromecast). Some of these older devices even got Widevine DRM still working after installing LineageOS, if you want to use a streaming service.
https://xdaforums.com/t/official-lineageos-22-for-amlogic-gx...