  We analyse a proposal that we have recently put forward for an interface
between matter-wave and optomechanical technologies from the perspective of
macroscopic quantumness. In particular, by making use of a measure of
macroscopicity in quantum superpositions that is particularly well suited for
continuous variables systems, we demonstrate the existence of working points
for our interface at which a quantum mechanical superposition of genuinely
mesoscopic states is achieved. Our proposal thus holds the potential to affirm
itself as a viable atom-to-mechanics transducer of quantum coherences.
