Lips plan: Take his helmet with the flashlight taped to it, add his pistol (with the handy pocket clip) to the helmet and throw it in the direction of the drone. Then change the target of the levitation spell from the rock to the helmet to fly latter towards the drone instead of the remains of the rock.
Goal: New target for the rail drone with light and heat (the flashlight) and a target of any MAD-scanner (the pistol). Lips own little flying combat drone 
1) Possible?
2) How long would it take, one complex action?
Cool idea, but few issues.
1. you cannot change target of the spell - you need to recast it
2. if ou'd be able to cast a spell on the thrown object, why not use that for stopping knifes thrown at you. Not sure if that's not too powerful.But still very cinematic, so I am going to allow it

use -4 modifer for the spellcasting test.
3. you need to spend at least complex action to attach the pistol to the helmet, and then complex to throw it and cast a spell on it.