Oh you poor thing! What a dilemma!
I have had girls crow a bit but not full on like you are experiencing with spurs etc.
I agree with Onyx - try night boxing and perhaps even speak to your neighbours explaining what has happened. They will be intrigued and hopefully this will prevent any complaints if they are really nice neighbours!
I have a young boy I want to keep pretty badly as sweet natured and very pretty and am thinking night boxing may be the go as our neighbours are pretty good (or just not home a lot!
but that may be a pipe dream as chickens are not popular around my area (though perhaps other people just have vewy vewy qwiet ones as I do occasionally hear a "I've just laid" cackle fest...but not a lot sadly)
Good luck - I do hope it works out for your trans-gender chookie!