I encourage you to rethink your conclusion. Other choice games have gender-inclusive options all the time, and it looks pretty easy when they do it.
I think this long thread can be boiled down to three basic rules for writing a gender-inclusive game.
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Give players three choices: be a boy, be a girl, or be neither.
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Use the right pronouns. The boys are “he.” The girls are “she.” Everyone else is “they.” Don’t worry about whether a character is trans or not. The pronouns are the same.
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Don’t talk about anyone’s naughty bits.
I’m a fan of rule #3 especially. The Lord of the Rings contains literally hundreds of pages of pure description, none of which is devoted to anyone’s naughty bits. Harry Potter? No naughty bits, not even during the romance-y parts, not once in thousands of pages. The entire run of Dr. Who? Nary a naughty bit. It’s just not important.
You can do romances, families, whatever you want. For 98% of text games, I’d say those three rules about cover it.