Custom Workflow Task List without Completion Percentage or Status

I am trying to create a "simple" task list that uses the characteristics of a Workflow Task, with the following specifications:

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  Use in a workflow to "Assign A Task" to a user.

  
  


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  Eliminate the following fields: Percentage Complete, Task Status.

  
  


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  The task should be "Completed" by selecting an "Outcome" if one has been chosen, the task should be marked "Completed", otherwise it should me marked "NOT Completed" (that simple).

  
  


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  I am ok using the OOB "Task Outcome" (Approve or Reject) or I can create a custom one, either approach is acceptable.

  
  

The "Percentage Complete" field seems to be a REQUIRED field, there doesn't seem to be any way to get the "Completed" field to change to "Completed" without the "Percentage Complete" filed (I have tried changing the formula of the "Completed" field to read "=LEN([Task Outcome])>0" thinking that would cause the "Completed" field to be "yes" once the user selects an "Outcome", but it doesn't seem to have any effect. Another thing I don't like is the default view of the Task list shows the Completed field as a "checkbox" and the user can check uncheck it right in the list view. I want to FORCE every task to have an "Outcome" selected before the Task is marked Complete.

I have tried several approaches to solve this problem over the last couple of days, including creating a Custom Content Type derived from the SharePoint 2013 Workflow Type. No matter what I do, the "Task list" still seems to rely heavily on "Percentage Complete" (and I think Task Status).

Any advice to this problem is MUCH APPRECIATED!