It would seem you have read the links I provided which is a good start.
That being the case you have seen what ( US) experts say would be the outcome of a military strike it would therefor seems pretty obvious that it is not a realistic option.
Your reference to nuke reactors is way out of date and has been made redundant by NK now having nukes. This was a deal reached years ago between the US and NK which the US reneged on, if they had carried through with that deal then things would very likely have been much different today.
As for the rest; your opinion well for all I know you may be an expert on Korean affairs if that is the case I would respect your opinion, however as I note you have a bridge for sale which you appear to believe you own I cant help thinking you may be somewhat gullible.