Gonk seems like a really nice crew member for only 2 points. Yes, it does take an action to load shields on the card and another to recharge the actual shields on your ship. I figure it should be easy enough to slow play in the beginning so you have at least 2 shields ready on the Gonk card when the actual game begins.
Gonk seems like a really strong late-game card because you give yourself an excellent chance to reclaim full points for your big base ship instead of possibly conceding half the points. Just the presence of Gonk might influence how your opponent is forced to play his endgame, so he might be forced to chase instead of flee for example.
Rebels have proven the might of regeneration. Will Gonk become a key upgrade for Scum?

