Reminders based on Start Date

Summary

What is the best way to set up reminders for incomplete tasks based on start date

Content

We want to set up reminders in our Onboarding process to the new hire if they have not completed their Employee Handbook Acknowledgement as of their start date. A daily reminder each day after start date if the task is not complete, and one notification to the hiring manager if it is not complete one week past start date.  I can't configure the reminders based on due date/task duration, because this does not synch up with start date. The only thing I can think of is multiple tasks to trigger email notifications: using conditions that the ESignature# used for the handbook Is Null and