Id go for Rune King Thor. All he has to do is mystically sever the connection between Jugg and his power soource, just like normal Thor has done to Classic Juggs.
Juggs is also vulnerable to mystical power and RKT has that in spades.
On top of that didnt Trio Jugg get defeated by a small group of X-men? Considering the methods they used theres absolutely no reason why RKT couldnt win.