Opening Opportunity Select Price Book in Lightning Experience

Is there any way to open the Opportunity Price Book selection prompt in Lightning Experience via an event or navigation? Here is what I have tried and does not work:

1. Navigating the user to the classic /oppitm/choosepricebook.jsp url. This takes the user out of LEX.
2. Rolling my own modal for selection. It is currently impossible to correctly enforce sharing on the Pricebook2 object in Apex and force:inputField is not working yet.

Edit: The intended flow is: user enters our lightning component via button click. If the Opportunity Price Book is not set, have user select Price Book (with sharing enforced), then continue to custom component.