I can't come up with any good solution for this. What you suggest barely hides the structure and contents of FeederData and I don't think it would solve the refactoring problem: add an element in the map, you'll have to add it in the parameters list.
All it does is shortening the definition by using predefined keys. In `TestFilteredFeeder`, we need to alter the keys of FeederData, so that wouldn't work.