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Based on what you described, I don't see any reason for you to fear prosecution. It's not a crime to change your name, refuse to marry someone, or write/promote a movie manuscript. I don't really understand your fears--unless you think the musician might sue you for trying to sell a movie based on you having a famous name and riding his/her coattails for your movie?? But if you changed your name back to your birth name, that shouldn't be an issue anymore.
Go ahead and speak with a lawyer about your movie manuscript and whatever else you need. No worries.