Random thought just popped into my head.

The Prestige

Twin brothers – think Rumple with all the showmanship of the imp, and spinner!Rum with all the soft-spoken quiet reserve away from the stage at least.

When one dons the hat of the magician, the other wears the hat of the manservant (think a mix of calculating Gold and physicality of Weaver).

They are very different, yet live the same life. And then they fall in love with the same woman. Cue Belle’s eyes narrowing in that “I know you are up to something look” because of the rapid personality changes and much panic because she can’t know, she’d leave. They are lying to her, it’s wrong, but what can they do? Two men, one life. The only way really is for one of them to become the manservant fulltime when away from the stage rather than switching but who?

The end result being that they eventually tell her / she walks in on them and they are nervous but Belle just rolls her eyes “I figured it out a long time ago. Honestly how do people not know, you are terrible liars”