Updating Rawhide vs GPG keys


Can somebody please enlighten me, how to update Rawhide after branching
and not using --nogpgcheck?

It seems that Rawhide keys were added in fedora-repos-30-0.4. So this is
the package which is still "rawhide" package and has "f31" keys. But
this package was not probably signed, because this directory is empty:

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Installing anything from Rawhide fails, because of missing GPG keys.

So is there a way to get the GPG keys via DNF? Would it be possible to
sign fedora-repos and fedora-release packages by older key to allow
smooth updates?