tlmgr --repository http://www.texlive.info/tlgpg/ install tlgpg
but still got a gpg unavailable message.
I hope someone (Norbert? Siep?) can understand what to do. I have no
idea myself.
After copying gpg.exe and iconv.dll from 2022/tlpkg/installer/gpg
into 2023/tlpkg/installer/gpg manually it now works,
Sounds like a good procedure to me :). -k