We too just signed a contract with ServiceNow and this is on our short list.
I know that some companies have done Orchestrations in order to link Configuration Items (CIs) between Orion and ServiceNow. If the CIs themselves exist in both platforms, then you can build Alerts off of the traps in Orion, emailed into ServiceNow, with the CI name in the subject (and possibly specific keywords for the type of alert).
You would then build Workflows in ServiceNow for those emails coming into the system, to first query the Incident and Problem tables for existing issues on that CI. If it finds one, then it just appends the most recent alert to the Open Incident / Problem. If it doesn't, it creates a new one.
This is how we're going to approach it.