Yes, the 858c HD DI will generate the 83kHz sonar signal with the Connected Transducer menu set to the Dual Beam setting. But this makes it act like a 858c HD unit (no DI sonar!).
Transom mount DualBeam transducer: XNT-9-20-T
They should do the exchange for an unused DI transducer for the DualBeam, but again: this makes it work like an 858c HD unit without DI sonar.