I don't see why not. But I am not familiar with how the Vizio gets the input of the sound. Where is the transmitter? If it is in the Vizio sound bar, then you will need to hook that up to the output of the pin.
http://cdn.vizio.com/documents/downloads/accessories/VHT215/QSG_VHT215.pdf
In this Vizio setup, the audio input is to the soundbar. So you would have to connect a speaker wire from the pin to the soundbar. Where are you going to put the soundbar? Inside the pin? On the top of the backbox?
Plus you are going to have to make certain that you have a full range input to the sound bar. Some pins have a low pass / high pass crossover built into the PCB amp. Others have a primitive crossover with the backbox and cabinet speakers. So it depends on the game.
And the soundbar needs to have low level input into it, so you likely will need to have a pad or resistor network to cut the power to the input of the soundbar.
Honestly, it hardly seems worth the trouble.
If you really have to have a sub hooked up to your pin, I would suggest getting a sub that has a speaker input and connect a wire from the cabinet speaker to the sub. You can experiment with disconnecting the cabinet speaker.