None of those solutions are suitable for this mission. These satellites need to be traveling a hundreds of thousand of kilometres an hour or more. Think about voyager 1 traveling at 65,000km/hr. It is still over 18,000 years before it will reach a light years distance and this mission is talking about 4 light years. So the launch really has zero importance as does getting these satellites up to massive massive speeds. Anything less then like 1million kilometres per hour is probably just too slow. Edit: even at 1 million kilometres per hour it would still take over 4000 years to reach the full distance so really we need to be going unimaginably fast to get there.