Blink in offhand

I had 60 free spirit to reserve in my offhand, so i decided to reserve blink.
I expected to be able to bind a "blink button" so to say to my hotbar and have the aura only work in weapon set 2.
There is no such button, however what i can do is manually press X and press dodge roll to blink.

My thinking is that either this is just unnecessary input complication for the player, and there might as well be a blink button, or this is unintended, in which case ... I have no idea how one could stop players from manually swapping.

PS: if this is intended, its a better solution to getting surrounded by monsters for players who need it, than forcing ggg to make dodge roll have phasing
(that is, after you get a lvl 14 spirit gem)