Frustrated square-lattice antiferromagnets with competing interactions are prototypical model systems to study complex magnetic correlations. For the generalised model including ferromagnetic interactions a new bond-nematic phase is predicted by theory. We have been able to synthesize the compound BaCdVO(PO4)2 and recently proved that it lies right on the border of a columnar antiferromagnetic phase with the spin-nematic phase. Theory predicts a low energy excitation mode, accessible by inelastic neutron scattering. Observation of this would be strong evidence for the existence of the long sought bond-nematic region. Here we propose to drive this material right inside the spin-nematic phase by an externally applied magnetic field. Temperatures below TN = 1K and magnetic fields up to Hc = 5 T are required, together with the excellent low-energy intensity and resolution provided by LET.