What's nice about option 4 is it makes explanation of the relationships easier in practice since asserting tables and the relationships in the choice model is tough too
Preferred to make changes in the assumptions and let the model output the probabilities
When there's better data in the future, then re-estimating the option 4 design is desired
Still some concern about ease-of-use and fixing poorly understand relationships into the future
Option 2 and option 4 are still being considered
Team to continue discussion and select an approach soon