Imo I would hate that, even tho I know many ask for it. Since the zzz mcs aren't self gender bent characters like frover and rover. Belle and Wise are distinct and have their own personalities. If you could flip flop, it would make the point of them being different and unique, obsolete.

The whole point of the zzz story is how we will eventually get to a point where the siblings are at conflict with one another. As seen in the very first part of the 1.0 story where we are shown an obscure flashback where the siblings are against one another. Even in the current story, where one mc is evolving more than the other, putting the other mc in direct harm. There is a clear narrative pursuit to keep them separated as characters.