SCOM 2012 delay forwarding alerts to internal connector

All,

Is there anyway to delay alerts being forwarded to a connector similar to how you can with email subscriptions?

I need to delay alerts being forwarded to AlertItNow connector until a powershell channel subscription has run.

The powershell script populates Custom Field 1 which is required to run before the alert is forwarded to ServiceNow helpdesk.

Thanks,

Darren