I've been trying to find a good 2 way radio set up, not CB. Since I have a Sena 10 headphone I've been doing a lot of searching for a bluetooh 2 way radio or a 2 way radio interface.
I've found the most useful info here: http://www.webbikeworld.com/motorcycle-intercoms/
The good news is ther is a way to get a 2 way radio into bluetooth. The bad news, other than the cost is that I haven't found a VOX set up. Fortunately one of the interfaces at least has a wireless PTT switch. Unfortunately (I feel like I'm in an old Abott and Costello routine?) there isn't a way to do software updates to the interface?
Initially I thought BT was BT, there was an industry standard--what a mess!!
I have seen an add from a company selling BT headsets where you can buy a headset, or the BT module, and it acts as a relay, or repeter, picking up signals from this company's BT modules and rebroadcasting them.
If that works, then communication can be maintained within a group.
I did run across mention that Midland might be selling a 2 way radio in Europe with BT built in?
Course, start looking at 2 way radios and there are at least 3 different legal radio types to choose from, FRS, GMRS, MURS. I do not consider CB to be reliable because of "Skip" and congestion. If I remember correctly one needs a GMRS license, $50 annual fee?
Since the entry level tests for Ham Radio were radically changed many years ago, I think the most reliable 2 way bike to bike communications is VHF, 2 meters.