Yes, If you can get them out of that mg soil your problems will be one or two less, I won't say they will be over, but minimalized to some degree by doing this.
Let them dry out bone dry, let the soil seperate from the side of the pot, do this by gently sqeezing apposing corners of the pot. This will cause the seperation, and in doing so allows air to the bottom of the pot. Thus allowing it to dry to some degree faster.
Transplant like described above in post #23.
These are kinda small, But I bet the 3 gal pot full of good soil will be benificial, at this point. had this been already transplanted. I think my suggestion would have been simallar to missnu's, I would just give it small amounts of water though around the stock this makes the root go a searching for a source of clean water,they do this by expanding and growing. You are by doing this growing a new, rejuvinated, un-fried vascular system for your plant.Thats why I place water around a plant recovering from nute and salt burned roots.
I simply don't like the effects of flushing a plant that's all, and have found several alternitives to try to avoid it, yes this may take a while longer for it to recover,but the overall recovery is much more to my satisfaction, IE less stress related problems, in my breeding programs the better.
If a plant was to get damaged enough to flush in my grow. I simply pull it up and put it into the composter.
I recomend to MOST growers that are talking about flushing,to do it as a very last ditch effort to save genetics that you can't afford to lose.