Google may have sparked some dissatisfaction by announcing YouTube Music for wearables, then confirming that it is compatible with smartwatches capable of running the latest Wear OS 3 version only. A "mobile security analyst" has tried what is probably one of the most effective work-arounds for this potential problem, but ultimately came up unsuccessful in this effort.
https://www.notebookcheck.net/An-analyst-establishes-that-YouTube-Music-cannot-be-made-to-run-on-older-Wear-OS-smartwatches.557213.0.html