I'm well past 200 N runs now.
Out of curiosity, what jobs can solo D with trust? So far I know of BST and RDM.
I solo D with trusts on BLU. It is a bit too risky for me sometimes but still fairly doable. I save sudden lunge for meteors in the second phase because Promathia quickly builds resistance and in my experience, the resistance doesn't seem to be reset between phases. That is also why I don't use any stunner trust. /DNC is a must to healing waltz the healer trust since they can't stay far enough and get hit by AoE silence.
I go with Selh’teus, Arciela, Apururu, King of Hearts and Amchuchu. Selh'teus for AoE hp/mp/tp, Arciela for AoE hp/buff, Amchuchu for obvious reasons and fast cast from Valiance. Arciela and King of Hearts also serve as backup buffers since Promathia dispels a lot.
The main reason why it might get too risky is that Promathia basically locks you when the healer trust is silenced and either Promathia has physical shield up or you have amnesia. Since you can't get TP or healing waltz the healer trust, the fight gets pretty messy.