Please branch and build rarpd in epel10. If you do not wish to maintain rarpd in epel10, or do not think you will be able to do this in a timely manner, the EPEL Packagers SIG would be happy to be a co-maintainer of the package; please add the epel-packagers-sig group through https://src.fedoraproject.org/rpms/rarpd/addgroup and grant it commit access, or collaborator access on epel* branches.
I have added epel-packagers-sig group as a co-maintainer.