Project Owners and OOTO

I am the project owner and I am going to be OOTO. I want to ensure that my coverage gets notified when tasks are marked complete so the job can move along as planned. Right now, the only way I am able to do this is to update the project owner prior to my departure. It would be great if there was a way to mark someone as interim project owner to ensure they get all the proper notifications while I am OOTO. Right now, we use the Sponsor field for managers so they have insight into a direct reports work, but we have considered doing away with that and using it for OOTO coverage.