Okay thanks. That wouldn't be so bad as I'm always changing inputs between my headset, airpods and previousaly the Bose.The main problem is that it doesn't stick to defaulting HomePod as the main output. At least for me this was a big issue because I didn't like keep having to change it every time I went to use it the next time it woke up.
Edit.
It looks like I can only choose the Homepod as an AirPlay target, is that right? If so, that's the same as my Sonos Play:1's so wouldn't make much difference. That's a shame.