Well, I could see that being potentially viable as a burst DPS build, but what does your DPS look like over a few minutes? At 500 crit chance, after which the derived crit chance starts dropping in efficiency, you'll have a 50% chance of doing 50% more damage. In other words, a 25% boost to your DPS. That is pretty big, but after the turret goes down, you'll lose 350 crit chance in Assault aspect. Thus I'm curious what kind of damage you do over an extended period of time, such as a regular boss fight. Honestly what I think concerns me more is this means you'll be getting buffed with Treachery, rather than Temporal. Solo and for a burst build, Treachery is definitely the better option, but my experiences with Temporal in a group have been that you see roughly a 20-30% boost in overall party DPS, just because global cooldown drops from 1.5s to 1.0s. Cramming more attacks into the same period of time is a pretty huge deal.
I'll admit, though, I have yet to make any attempts at the Order trials. I don't know what kind of build works best for that.