By the modern era, the "like X, but a girl!" thing had pretty much run its course and nowadays you can't get a Batwoman or a Supergirl off the ground without some new spin (or a whole lotta nostalgia). So, given that you already had Wonder Girl and Troia fulfilling the same function, there wasn't much reason to do "like Y, but a boy!"
In this case that's not necessarily true. "Like Y, but a boy!" has all sorts of gender and sexuality issues to be delved into, especially when Y is Wonder Woman.
It would take the right writer, though, and the character would have to be introduced with great care.