[Dovecot] Multiple auth client sockets

I use two seperate Postfix instances as MSAs (so that different policies are simpler to configure), and both of them require Dovecot SASL support.

Since Postfix' smtpd is chrooted (at least in the Debian package), the client socket needs to be somewhere under the instance's queue_directory. This means I need two different auth client socket paths. When I simply specify two "client { ... }" in dovecot.conf, the second takes precedence over the first.

Besides using a second dovecot instance, which I'd like to avoid, what ways are there to run a second client socket?

Ulrich