Conformally K\"ahler, Einstein-Maxwell metrics on Hirzebruch surfaces

In this note we prove that a special family of Killing potentials on certain Hirzebruch complex surfaces, found by Futaki and Ono, gives rise to new conformally K"ahler, Einstein-Maxwell metrics. The correspondent K"ahler metrics are ambitoric but they are not given by the Calabi ansatz. This answers in positive questions raised by Futaki-Ono.