Now to a much simpler question:
I'm pretty sure the answer is yes, but I'll ask anyway to have confirmation
Does Snipe benefit from Flight Controllers i.e. Snipe 4 for E-Wings if activated by Flight Controllers?
It's an attack so it should work, right?
If Flight controllers can be applied at your leasure, then sure. You're using the appropriate attack and can get an extra die.
The part that sways me is that flight controllers doesn't mention a timing so the most logical timing is immediately upon being selected for activation.