Mapping LDAP eduPerson to posixAccount

I have a central LDAP server which provides me with a DIT containing eduPerson entries. I want to import these entities into a second LDAP server as posixAccount entries, so that users can log into a Linux machine by authenticating against this second LDAP server. Passwords are handled by a separate RADIUS server.

Currently a script calculates differences between the two LDAP server generates an LDIF file which is used to create or delete entries on the second LDAP server. The script is also responsible for adding extra data needed for posixAccount, such as homeDirectory or loginShell.

Is there a better way of realising such a mapping between eduPerson and posixAccount?

(I am surprised that it is not easier to find information about this. It would seem to me to be quite a common requirement for many institutions. Or do the people running the Linux machines just manage their own local accounts?)