Workflow Over Powershell?

Hey Active Roller!

I'm currently working on a project to get EmployeeNumber added to all active users who don't have one. It's about 50/50 right now. I was working on a powershell script to inject right into a workflow, but I was wondering if there is a way to do this just using AR workflows instead of powershell. I'd like to explore and use all functions of AR rather then keep throwing powershell scripts at it.