And if they don't match, then you get a bonus cinematic right at the offset of your character taking a potion, and voila, poof, problem solved!

"Trans" people don't identify as "trans". They identify as "man" or "woman", and happen to have been born the opposite. It's a tragic medical condition with currently very lackluster treatments, not a fashion choice. Those with gender dismorphia would LOVE to have magic magically solve their mismatch, because it fucking sucks as a condition to have from what I understand, lots of suicide, lots of pain. People who identify AS "trans", that identify AS a medical condition rather than what the condition imposes upon the people, are just as bigoted as those who put on a giant feather headdress and dance around slapping their mouth making "aoaoaoaoaoao" noises or those who tell people with clinical depression to just cheer up and be happy because they're totes sad sometimes too.