No this does not work. We tried it last summer with the RSS 8.4 2007.
The North mast is much stiffer in the bottom. The shape in the bottom is not full / deep enough, the sail is to flat, so you don't get the correct perfomence. The sail does not deliver the power in light winds like with the X6 mast and does not twist enough in high wind / overpowered situations. The Noth masts have a more top twist.
Invest in the correct mast is the only solution to get the best out of this sail.
Sieger NED 331