Could we migrate the user accounts using Powershell

No. But there is a command line utility that could do it. 

Also you could use the configuration of the directory sync to meet the technical requirements while using powershell to add the object into the scope of the sync dynamically. 

No. But there is a command line utility that could do it. 

Also you could use the configuration of the directory sync to meet the technical requirements while using powershell to add the object into the scope of the sync dynamically. 

What is the command line utility that can do it?