this is what I have done and works great.
my 2015 is the base model.
I bought the sena sm10-01 Bluetooth transmitter, (you can use just about any Bluetooth TRANSMITTER) a 3.5mm plug ground loop isolator and the Honda cord that u use between the helmet cord to a 3.5mm jack so you can use basic headphone in your ears.
also a 12vlt cigarette/usb power box.
plug in the cord adapter to the headset cord, then the ground loop isolator into the sena. Power the sena into the 12vlt plug, I actually plugged in a portable XM radio into the aux plug on the bike.
So now any and everthing that would be sent to my helmet will now go via Bluetooth, and you can volume up and down using Honda volume switch,
Everything but my XM radio is in the left pocket and I have the xm radio velcroed to the outside of same pocket.
Everything is buried under the left pocket but for the sena. Tucked all the cords etc under there. Not sure about intercom as both of us would be under a bluetooth. I guess plug in a passenger headset on the rear and see what happens.