In this work we empirically show that the Emfit film can be stuck on a curved surface without influencing its original electromechanical performance. This characteristic along with the previously reported piston-like response of the film at frequencies below 150 kHz, opens up the possibility to fabricate ultrasonic transducers of complex developable substrate and subsequently, customizable acoustic field. As a first step to complex acoustic directivity patterns, a quasi-spherical substrate is proposed in order to customize an omnidirectional radiation field. Numerical simulations were used in order to show that such an omnidirectional radiation directivity pattern can be approximated by an Emfit based transducer stuck on a quasi-spherical substrate. This works shows preliminary efforts directing to build an omnidirectional, spherical ultrasonic transducer, based on Emfit film.