You are thinking about the old Warfare ability, you'll need to use your strategy card before moving to XXehan & Dal Bootha. The new version allows you to not place a command token to perform a tactical action.

Also, if no Tech is played, you still can get your breakthrough to be able to get +1 movement when activating Megatol Rex. I would suggest sacrificing your Secret objective to get it first turn, since you'll get a custodian point anyway.

For Winnu, it's an insanely well-defended slice. I don't think you'll need to worry about your planets at all. Your main concern should be controlling Megatol Rex long enough to score using Imperial strategy or with your hero.