Regarding (ab)using the flatpak-kde-applications, the biggest problem I see is that maybe it won’t be very discoverable. Given it’s just us doing flatpaky things, maybe it’s not a big problem though. Users will still be reporting per-app in github/flathub/org.kde.* and that makes sense.
In fact something I wonder is how future-proof stuff in flatpak-kde-application is. Re-purposing and making it part of our daily affairs could help making sure it’s seen as a collective thing rather than KDE’s or mine even.
I’ve aligned the membership of the KDE flathub team with the invent team. Going forward flathub admins (like me) may need to be poked to make sure this is kept up to date.