If I looked like Miscavige and wasn't him I'd be in severe danger because so many of the people I'm surrounded with would hate my guts and I would neither know who they were nor have the knowledge or ruthlessness to defend myself against them, so I'd have to get out of there and quickly.
-snip-
Where's your sense of adventure and your sense of curiosity?
With Miscavige's body, and his fingerprints, you could quickly learn his signature.
You could have control of multiple billions in property, foreign bank accounts, and all the rest.
You'd be the total dictator of a wealthy mind control cult that uses spies, information control, and an electronic device (and fear of such a device) to monitor its followers' thoughts and actions.
You're surrounded by sycophants and run your own prison for anyone who displeases you.
You can interrogate anyone for any reason in any way you please.
You have access to all of Miscavige's extensive written and audio records, and access to all of Hubbard's secret archives, including Hubbard's handwritten (complete) Affirmations, personal correspondence, medical records, photographs and home movies (including filmed over-boardings on the Apollo). All of Hubbard's secret orders and instructions would be available to you.
In the mean time you could repay people who'd been ripped off, and make restitution to those who've been hurt.
You could slowly de-condition the membership by telling them that "Ron wanted them to understand certain things on a certain schedule," and use all the right cult buzz words while slowly freeing them from the Scientological Chinese finger puzzle/trap.
You'd be in a position to expose all of Scientology's secrets, reverse its IRS tax exemption, end the Sea Org, and bring the mind control cult crashing down.
And, in the end - since this is a fantasy - we'd have friendly beings from another dimension rescue you from Miscavige's body, and return you to your own body, which had been safely held for you in a state of suspended animation, and return Miscavige to his own body, where'd he'd discover it was months or years later and the cult no longer existed, its billions in assets having been liberated along with its slaves.
And life could go back to normal.