So, being her, I would introduce myself to everybody by my preferred name, use it in written form everywhere I could get away with it, and spit my government-approved name with as much contempt as I could muster only when required by some bureaucrat (and then say, “but REAL people call me Blaer.”)
And dangit, if my Momma called me "Dog Poop" and the Government wanted to call me "Humilis Vectigal Generans" (look it up), I'd probably settle on "Skyway Thunderbolt" as a reasonable compromise, and use it as outlined above.
Stormageddon, Lord of Darkness.