Given the whole situation I'm pretty sure the trap is the original version. It just makes sense in more than one way. At first, Eve was the only schoolgirl who didn't have a predefined story all along. With every other girl it was/is more or less clear where her story was going, but not for Eve.
Next to that Sploosh did, right after Eve won the poll, indeed say something along those lines, that the "female" story would be the alternative, which I guess it is. They did manage to find a compromise that's viable and I would have expected a bigger difference.
And last but not least there has always been some truth to DC's jokes. He joked about a monster girl for a year and then we got Aqua, just as he's been joking about the schoolgirl trap for ages. There's no way he would have done that if he didn't at least have an idea who it would/could be.