Dark minimalism

I was talking with a friend about how the Bullet Cluster is supposed to favor dark matter theories over modified gravity theories like MOND, and opined that the distinction isn't absolute. I started with the example of supergravity: the gravitino is part of the gravitational superfield, yet it is also a candidate for DM particle. Then it occurred to me that perhaps the scalar in a scalar-tensor theory of gravity could also be the dark matter. And just now, I've thought: what if dark energy is the VEV of some field, and dark matter is the quanta of the field?

So this unified minimal model of the dark sector is, a quantized scalar-tensor theory of gravity, in which the scalar component has a VEV (the dark energy) and its quanta are the dark matter. It wouldn't surprise me if this exact model already exists in the literature. The question is whether there are some obvious or non-obvious reasons why it's wrong...