Unfortunately, too impractical
To fly, you need to do one simple thing - beat gravity's hold on you. How you go about doing it is your business, but the more mass you have, the more force you need. And that's when we run into everyone's favorite enemy of flight - the dreaded square-cube law. Essentially, as the size of an object increases, it's surface area increases by the square, and the mass of the object by its cube. So, to put it simply, double the size of an object, and the mass is increase by a factor of 8, because that's 2 cubed. Quadruple an object, and the mass is increased 64 times.
A butterfly is pretty small, so it's wings are needed to be that complicated for its mass. But, for instance, let's take a bird. Birds are far larger than butterflies - maybe 10 times larger, so they have the equivalent mass of 1,000 times the butterfly. And the same propulsion mechanism a butterfly uses just can't keep up with that increases - the lifting power of butterfly wings doesn't increase by the cube. So birds have different wings, and there wings are far more complex but far stronger than bird's wings. They also have specialized designs.
A human is even larger than a bird, and thus cannot use either the butterfly's wings or the bird's wings to fly. Instead, we fly a different way - building machines that can use far more power than that of a bird's wing. But a butterfly's wing scaled up is fighting against the cubic increase in mass, and that's not a fight a butterfly can win.