You could still use Luke as part of the failed attack on the uncompleted DS, just have his 'great piloting skills' save him from 'getting a little cooked back there' as the fleet is escaping with their asses whipped. Of course, he wouldn't really get his medal either seeing as he didn't destroy the DS, so it'll be interesting to see how you resolve the medal ceremony - if there is one.
Looking forward to seeing this release. Good luck!