As a person who works professionally in Computing and with all the horror stories regarding UConnect from Jeep et al, I wouldn't want to invest the time in retrofitting this. The "Connectivity Box" is going to be another point of entry for a suitably skilled cracker to break into your car which is something I simply would not want in my car at all.
Depending on the implementation, it may not be that hard to generate a TAN code that can pop your boot and then steal anything out of your car.
Apologies for the negative sounding comment but Smart really needs to focus on building a good charismatic car, not this security breach waiting to happen.