Enable service orchestrations for email events

We would like to be able to assign a priority level to events originating via an email integration. Looking at the documentation (https://support.pagerduty.com/docs/event-orchestration#create-a-routing-rule), it looks like its possible for global orchestrations, but not for service orchestrations.

My team maintains >400 services that receive events through email integrations, and to reduce noise and the amount of effort required to maintain the configuration, we’d like to be able to assign priority to incidents. While this would be possible with a global orchestration, it’s not feasible for us to reconfigure all of the inbound email addresses to route through global orchestrations - it would be much easier to be able to apply rules to existing services/integrations.