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The only statistics that are specifically mentioned in the spell description are mental ability scores, alignment, and HP, so if the statistics that aren't mentioned are untouched, that means that the only things that change are the target's mental ability scores and HP.

It won't work for two reasons. The first is because True Polymorph states "The target's game statistics, including mental ability scores, are replaced by the statistics of the new form." That means that all the target's old statistics (its HP, its class levels, its features, its proficiencies...