centralize keys location for multiple user keys?

We have a (perhaps) unique problems:

We have a number of jobs that run on one machine, and ssh to a different machine to run a command.

A --> B

The problem is that the home directory is ONLY visible on the the second machine (B)..

When the scheduler "su's" it the user running the job, not authorize_keys file is found in the users dir, so the ssh requires a passwd..

We cannot replicate home dirs to all machines, and NFS home dirs is not really an options. Neither is an ssh-agent, because it requires manual intervention at times (i.e. machine reboots).

is there a way to setup all the keys in a dir such as

Machine A:
/all-my-keys

key.user1
authorized_keys.user1
key.user2
authorized_keys.user2
key.user3
authorized_keys.user3

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Machine B:
/all-my-keys

key.user1
authorized_keys.user1
key.user2
authorized_keys.user2
key.user3
authorized_keys.user3

such that we have a shared dir, so that for each user, there is a key file, and an authorized_keys file unique to that user?

                                        -alex

Name : Alexander N. Spitzer
Phone: 617.407.2274
Fax  : 509.752.4680
Web  : 
http://www.spitzer.org