First, thanks Dan for the detailed description for the XC Soar part. I don't use XC Soar, so I couldn't help with that.

As for the Bluetooth adapter, I'm not sure if a generic unit would work. The LX Nav adapter has an RJ connector that plugs directly to the PDA port on the back of the V7 and is wired correctly. I suppose if someone knew what they were doing, they could probably make one. But, the LX Nav adapter is only 75 Euro compared to hours of tinkering.