Is it possible to access the speaker in the DualShock 4 controller without the PS4 kit?

Dear Devs,

I'm currently working on a game in Unity3D in which we want to use the special features of the DualShock 4 controller. We have yet to contact Sony, but we wanted to make a prototype before we do that. We've managed to make most of the features work thanks to the rewired plugin, but it seems to lack an option to access the speaker in the controller.

Has anyone found a way to access the speaker without the PS4 kit? Is it even possible?

Thanks, Ruben