There's no need for you to have Somatic Weaponry due to your shield hand currently being free to do the somatic component of a spell, and WotC ruled that it's a free action to simply take your hand off a two-handed weapon, perform a somatic component for a spell, then put the hand back.
JPM doesn't progress Setting Sun maneuvers so you won't really be able to make it your main discipline (unless your DM allows a discipline swap). Recovery mechanics for the swordsage are also crappy even with Adaptive Style, so you could run into issues of not having enough maneuvers if that's what is needed instead of spells.