My only complaint with the event is that you had to get 500+ tickets in order for Lechenaultia to join your team, I just didn't have the time to reach that amount of tickets.
(Between Flower Knight Girls and Kanpani Girls, I can only spend around 10 minutes to an hour each day playing them, and I've pretty much stopped playing Shooting Girls altogether).
100 tickets wouldn't have been that big of a deal, but I feel that the bare minimum was too high for this event, considering how little you were required to make for the previous ones.
To make matters worse, I've been having to use Mozilla to play Nutaku's games lately, which loads slowly for a lot of them, because my browser of choice tends to blue screen for some reason, so it takes several minutes longer than usual to get anything done. -_-

Regarding exclusive characters, it was for the gatcha, so odds are very high that you would probably not draw one of the reskinned versions anyway.
But assuming that we were to actually get a reskinned version, I don't see the huge deal, they could just release it for the Japanese users several months following, so instead of exclusive skins it would be early access, which is pretty much what they Japanese users are already getting.