Is it possible to pipe sound into a Mac or iOS device, which then sends it to the HomePods? Macs can now use HomePods as the sound-out, so presumably this would be possible (but kludgy).
I tried setting it up the other day after seeing a fork that has addressed some of the isuses, but I only had about 2 hours to try getting it working before giving up.
For those interested, just keep in mind the chances of it working are pretty low without some debugging, and most people run into issues with it