No one said it would be easy...
True, but ....
It's taken Voyager 40 years or so to get where it is now. At that rate, getting to 550AU will take about 160 years. So, a much more robust boost system will be needed.
At 125AU Voyagers signals are very faint. Since the signal drops off with the square of the distance, signals from 550AU will be incredibly faint unless a really robust transceiver is used.
It will be sitting in interstellar space, and bearing most of the full force of cosmic rays so all of its systems will have to be very robust and most likely will have to have a high degree of redundancy.
All of which means the craft will need a very robust, much larger power source, perhaps a real reactor instead of living off the drizzles of energy from the natural breakdown of plutonium.
All of which means we're looking at a craft that would be significantly bigger than anything else we've ever launched outside of Earth orbit.