humm. not sure how to export/import really but here may be an idea. Have your vCenter alarms run powershell scripts and keep those powershell scripts synchronized between the two virtual center servers?
http://blogs.vmware.com/vipowershell/2009/09/how-to-run-powercli-scripts-from-vcenter-alarms.html
Or are you worried more about redundancy for vCenters? have you looked at Linked mode at all with vCenter? or vCenter Heartbeat
