ah. Well Greer is still there to romance if you really liked the game. You could still play his route.
Jude doesn't really do gender selectable ROs because she sets up characters specifically. So yeah like you said it's a big ask and alot of extra writing and coding I'd imagine doing routes for 8 people. If the 4 ROs were gender selectable.
There are alot of other great IF games with gender selectable characters luckily If this one doesn't do it for you.