I don't believe that Ciscoworks does syslog forwarding, but the latest version of MARS supports being 'fed' syslog messages via a true syslog forwarder (e.g. Kiwi Syslog). I think Kiwi is free or otherwise inexpensive (compared to MARS!). Have the devices forward to the Kiwi server, and then forward to LMS and MARS respectively.
There's not much integration between Ciscoworks LMS and MARS since it was developed as an independent product and then acquired by Cisco a little over a year ago. Based on conversations I've had with the MARS TME and my Cisco reps I think they've heard the message that we want better integration, but they're probably going to focus on security features first, and integration second (and rightly so.) Still, it certainly would be nice to tie into the DCR instead of the kludgy way you add devices to MARS now.