An ideal system to deal with the NK artillery is MLRS. It can nuetralise gun crews over a wide area and can repeat the effect as long as ammo is available. The downside being that it would need to be based in SK so would instantly involve SK even if fired by US army personnel.
I would agree, and apparently SK has developed its own, known as Chunmoo or K-MLRS in military-speak. Probably on high alert at the moment.