How does Death grip work? Does it drag you across the screen, or is it like a teleport from your location to them?

If it's an animated dragging of your main character, your slave children should be able to follow you for a short distance before you pull away. Perhaps putting them in range of your new DK target? If not in range at least they would be facing towards you, and you could simply hit autorun on all clients and spam your follow macro when they begin to get in range.
If it's a teleport type thing, we might be SOL for easy fixes.

As far as the knock back is concerned, What's the longest knock back? 20yds? Drop a totem, and have your slaves stand on it, then with your main walk out of range of the totem effects. Then tap forward towards the totem until you pick up the buff, I used grace of air 30yd range according to the tool-tip. Now hit your follow macros. From my basic testing it seems as though /follow has a 25-30 range limit on it, so no big deal on 1 knock back.
Now if a couple of people get clever and come in and bounce you around a couple times, it's possible to get out of range of follow. Though, I'm willing to bet there will be a DR or immunity to knock back. If not with 4 or 5 shamans doing round robin knock backs...and spamming chain lightning as the melee runs back into range, between knock backs. It is US who should be feared.

Just my thoughts anyway...