Sync LDAP passwords with KDC User Principle Password in RHEL4

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First of all, I am posting this question out there because I have not found an answer to issues I am having.

Background:
The company that I work for has Active Directory set up and I am exploring ways to integrate our Linux and HPUX servers into this scheme for single sign in functionality. The kicker is, I don’t administer the Active Directory, and those who do refuse to change the schema to allow for better interoperability with *nix. So far though, I have an ldap bind account and am able to set up authentication via ldap.

What I am trying to do:
I have a Kerberos KDC that I have set up with a single realm serving one domain. I have a few principles set up for users and hosts and am able to do passwordless logins with credential forwarding. I want to be able to associate the kerb user principal passwords with the ldap passwords. In this way, I can have all of my *nix servers authenticate regular users against the kdc using their ldap passwords, and I get the added security of no clear text passwords. Is something like this possible? I.E., to have a mechanism that sync's the users ldap password with the Kerberos credentials password.