Re: Switched to controller. M+K are locked out and I cannot switch back...

Ok, no official response but I did find a workaround on segmentnext.com and will paste it below...

#3 – Dragon Age Inquisition Stuck at “Press Start Button” Screen / Using Xbox One Controller When Keyboard Not Working!
Until Bioware releases a patch that makes Xbox One work properly with Dragon Age: Inquisition, go to documents and find save directory in bioware/dragonageinquisition/.

You should find two profile files that you can delete. Deleting these profile files will restart the game from the beginning. When the game starts, you will be able to play with Keyboard / Mouse.

Do note that you can either use Mouse / Keyboard or a Controller, you can’t have both.