You will definitely need to get to the dolphin striker when the boat is leveling out. The momentum from the rotation and the wind will want to push it right back over the other way.

Getting out of the way of the hull really isn't that difficult - once the boat reaches about 45 degrees, your weight is really not a factor anymore and you can begin to position to reach the lowside dolphin striker. If you're righting pole puts you far away from the boat, you could possibly be in the path of the high hull as it comes down to the water - just be aware of this (and make sure the daggerboard doesn't wedge itself between you and your life jacket!).

Trailing a line off the rear beam sounds like an interesting idea for the kids - I would think that if they were 5 feet behind the boat they would be safe. However, the boat will tend to drift downwind with the mast trailing so they will be on the opposite side from you and possibly near the mainsheet and boom as such. Their presence in the water will also tend to spin the boat as they are pulled through the water - and that might impede your righting attempt. I would probably put them sitting comfortably on the hull in front of the main beam and instruct them to hang on to the dolphin striker, or the righting line that should be trailing behind the boat just after righting.