[Interaction of ionized and ailerons]

On the TIE Reaper and Striker, the timing of their Controlled or Adaptive Ailerons abilities is "Before you reveal"

A ship cannot use abilities that trigger from an ionized ship revealing its dial.

Does that mean that ionized TIE Reaper and Striker cannot use Controlled or Adaptive Ailerons when they are ionized, even though the timing is "before you reveal" and not triggering from revealing the dial literally?

[R2-D2 Crew - what if you are damaged but have no facedown cards?]

If you have R2-D2 Crew (Rebels) and are damaged but have face-up damage cards, can you still use his ability to regain a shield, given that it would be impossible (if you roll a hit) to expose one of the damage cards?

I'm guessing the answer is no, because you are unable to pay the cost (flipping a card), but I wasn't sure.