Ha! You are proposing three fields instead of two for the exact same information, right? 
Other than preference, is there any good reason to make that change in the model, requiring all tools and modules to change?
I realize the job of an ETLer for getting the dose right is a tough one. Which is why we are trying to make it easier, even though it’s not our fault that the data is so crazy. Why don’t you respond to the proposal on the table and make your suggestions?