I want to run a VWF multiple times.  The first time, it should create a new object instances (which it does just fine).  Subsequent flow runs I want to pre-populate the screen Radio Buttons with the previously stored values.  I can retrieve the instance attribute stored values just fine into VWF variables, but I don't see a way to assign a variable to a radio button screen choice field. 

Example:  Radio Button screen choice field (20 of them in total) each with 3 choices (Pass, Fail, Needs Review as the stored choice value).  For each Radio Button screen choice field, there's a custom field (type Text) that has one of Pass, Fail or Needs Review strings assigned to it. 

I don't see it as practical (20 x 3 = 60 Decision) to try to work out which choice relates to the custom field's stored value and set the screen choice value at the choice element level.  But that appears to be the only option.  Am I missing something?