KDE provider is ready and available from version >=kde-frameworks/kwallet-5.97 See ebuild TODO. https://bugs.kde.org/show_bug.cgi?id=313216
Did you check that it works fine for you? See latest comment in the linked bug.
(In reply to Andreas Sturmlechner from comment #1) > Did you check that it works fine for you? My reason is install vscodium without gnome-keyring. It works. I am using gpg-agent for ssh and git. Kwallet used by NetworkManager to keep wifi credentials. It is normal non-GPG wallet, so i am not affected by deadlock bug.
Just as an extra word, I can also confirm kwallet works quite well for all the secret-service apps I have.
It seems - see the linked KDE bug - there are still problems with this, could someone who uses that desktop environment have a look into it? Detaching the PR from the ticket for now so that it does not get accidentally merged by someone doing house cleaning.