Mass Action - Multiple Actions - Single Action or Count Triggered?

I’m triggering an action on multiple EPEmployee rows on GI ScreenId=EP2030PL.  The PXAdapter TotalRows = 0 on each action call, and for each Base.Employee.Current is obviously a single employee.  I would like to either get the row count on how many where triggered so that I can make an API call on the last one, or get an indicator when the last action is being called.

I’d prefer to get all of the selected Employee objects in a single Action on PXGraphExtension<EmployeeMaint> without creating a custom DAC and custom MassProcessing screen.  Is there a way to do this?