Assigning Journey Tasks before the Hire Action becomes effective

Summary:

Our Client has a requirement where they want to achieve the following:

1. Pre-Boarding Journey: 

Effective Add Pending worker - 5 days to act on the task

Assigned to Pending Worker :July 7th

Due Date based on Duration: July 12th

Converted to Emp on July 10th

Tasks should now to be completed by july 10th and update the due date.

Can this be achieved using any of the delivered fields or any other way?

Content (required):

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):