Hi KinkiePinkie,
Good luck on your game.
Looks like you are thinking too much about it. It is not a thriller novel stuffed with fetishes. It is a porn game with fetishes, with slight touch of thriller and a story wrapped around them and heavily dependent only on them.
Even if Alex's goal is to transform completely, it doesn't mean that MC can not talk him into staying in between, with dick and tits, after they fall in love, just for the story to be realistic enough.
In this intro the main goal for me was to add as many fetishes in a car ride (with the main game in mind) as I can and make it realistic. Then I created characters and then a story. The story is not complete. I am not Tarantino or someone who can keep a 6 season series in his head. I am a busy man eager to share with you his vision on a porn game.
I am completely sure, if I implement the surgical transformation, Alex will become just yet another girl and the whole 'shemale' stuff will remain only in text and will not be so interesting. It will look and feel stupid (for me at least). Because you can not tell is it a true girl or a boy after operation when you look at a digital female character rendered in DAZ studio. You can use your imagination and tell that all the girls in the car are boys after operation with the same effect.
It depends on support of course. If it will be enough to buy great PC to render both versions (dick/ no dick) and write two different dialogues for them without delaying updates too much, hire a coder to take care of too many decisions, and patrons will ask for it, it would be pleasure for me to add as many different twists as I possibly can.
For now I can not be sure that I will manage so please don't wait for it.
Sorry, English is my 3rd language. There may still remain some misunderstanding.