Just another idea I've been thinking about.
We know that stargate travelers can only go in one direction based on which way it was opened. However signals don't have to follow that rule. Going over the power options of dialing Destiny, a black hole should do the trick. As was seen in 'Project Pegasus', it would require sacrificing a stargate and maybe Destiny if they don't destroy the stargate after they are done. But nonetheless it should dial with the only negative side effect being the time dilation in the beginning. If locking onto them is an issue, I'm pretty sure the SGC can easily build some sort of signal booster so that the asgard beaming technology can lock onto them and pull them through the gate back to the Milky Way galaxy. But of course this is all just a theory based off the rules presented so far and some based on assumptions.