Hey chaz, how handy are you with wiring? You just might be the perfect candidate for some experimentation I've been thinking about. If you're not familiar with it yet take a look at the Sena Freewire BT adapter. It plugs into the wired headset dash connector and BT connects to your BT helmet headset.
https://www.sena.com/product/freewire/. But here's the catch. They only offer adapter cords for Honda and HD. Here's where your wiring skills and willingness to experiment come in. HD and Spyder both use 7 wire headset cords, but the pinouts are a different configuration but all the same functions. If you go here,
http://www.edsets.com/edsets_docs/PopularPinouts.pdf you'll see the pinouts for HD and Victory. The Victory is the same as for Spyder. Buy a set of 7 pin DIN connectors and wire them to make an adapter from the Spyder pinout to the HD pinout. Plug the adapter into the Spyder and the HD cable into your custom adapter and voila!, you should be able to have BT from the entire Spyder system, including CB, and BT connect to your riding buddies.
I've considered doing this but I have no overwhelming need or desire to use BT. The one time I needed to communicate with another non-CB person, my nephew on our way to Homecoming last spring, I bought the Sena SR10 and connected it to a handheld CB I had. Tim used that with his Scala BT helmet headset. It worked good, but not super great, but was plenty good enough for that trip.