They trying to make Banjo more straight by giving a love interest out of the blue was too much of a stretch for the plot... Let the gays have their Riders

And I was felling that inch that one of the women of the team could be a Rider (she is just screaming for help, c'mon, kick some ass, girl!)

But for epilogue purposes is quite ok. It's cool to think that Banjo and Sento live together and sell his inventions on street market. And everyone remembering them (specially Misora) was a cute twist