We want to have two separate services, and the ask is that there will be two services.
The first service is an On-Call Engineer on a weekly rotation. At the end of the 1st week, the on-call engineer will become a support engineer for his second week and will help onboard the on-call engineer and will continue as a support engineer for the second week and will help close the issues that are still not isolated or mitigated from his shift as on call engineer.
This is not a primary vs secondary as this is a separate role. I want to use the same rotation with an offset so that the on-call engineer transitions to support the engineer for the second week using the same rotation.