It shouldn't have to actually "hook" to the portable receiver. Anything that pings the ground station will make traffic/wx show up for the receiver. For me the debate goes on whether I want to have a certified solution for the display or not. I generally do, I like certified/tested equipment. I've had one too many iPad failures to want to rely completely on one for flight data.
That said, in a VFR only airplane like my 7GCBC, a GMX200 and GTN650 might be overkill.