Looks fine to me. I don't use KDE, but searching, it looks like KDE Plasma's audio mixer is "plasma-pa". The "pa" there will stand for "PulseAudio", so at least at one point, it'll have been based on PulseAudio. I dunno if it talks natively to Pipewire now.
kagis
https://old.reddit.com/r/kde/comments/v8hbyb/something_like_plasmapa_for_pipewire/
If you have the pipewire-pulse compatibility layer installed (which you really should), plasma-pa will work without any problems. Right now there is no pure PipeWire equivalent of it.
That was three years ago, so might be out of date, but at least then, it still used the PulseAudio API, so it may need pipewire-pulse to be active. In any event, I don't think that it'd hurt to have pipewire-pulse.
I'd check and make sure that pipewire-pulse is active too, and if so, try using plasma-pa
to have PipeWire set the volume to whatever it is that you want set to. I assume that once you've set a volume with PipeWire, PipeWire will handle restoring it next time you log in. It does on my system.
Swords are off-limits:
https://www.legislation.gov.uk/ukpga/Eliz2/1-2/14/section/1
That being said:
I'm not aware of anything restricting armor use in public in the UK.
kagis
https://www.uk.safeguardclothing.com/blogs/articles/body-armour-uk-law
There is a law against wearing it in Parliament.
https://en.wikipedia.org/wiki/Statute_forbidding_Bearing_of_Armour