Wanting Bluetooth in 2001 Chevrolet Silverado 150p

Hi all,

I would like to put Bluetooth in my 2001 Chevrolet Silverado 1500. I would like to: keep the head unit, I would still want the radio and CD to still work, and I would want it hidden, no fm transmitters or Bluetooth dongles sticking out. What would be a way to achieve this?

Thanks
BoBizzle