Need the ability to identify a unique Product Owner for Product Lines and child Products

I am the admin for my account and as such I am listed as the Product Owner for everything in my portfolio. I have nothing to do with the day-2-day management of any Product Lines or Products.

Goal:

I would like to be able to identify a specific ‘Owner’ for

• Product Lines
• Products
• Releases (this functionality already exists)

Challenges:

• In our organization, from an administrative point of view, only Aha admins are Product Owners
  This is because users inadvertently created additional Products &/or added users and we wanted to eliminate these issues
  
  
• The default Product Line/Product profile shows ‘Owners’ and this pulls from the User access list. I can’t hide this field or otherwise edit it (see attached)
  This is problematic because even if I create a custom field, then I will have TWO values showing to the end user
  
  
• I can’t specify custom fields for the Product Line (i.e. Product Line Owner) and something different for the Product (Product Owner)
  (technically, I can probably make this happen, but I would need to create a fairly elaborate system of virtually identical layouts)

How can I show an Owner (regardless of Aha Access level) for each Product Line all the way through to a Release? (all of these fields need to be independantly reportable)

e.g.
Product Line 1 – Mr Pink
     Product Line 2 (child) – Mr. Orange
          Product – Mr. Brown
                    Release – Mr. White