I have been doing a 10 AP fire/water build primarily with clock and burn.
Seems like Temporal Dust is largely dependent upon placement, enemies moving where you want them and allies staying clear so I have not used it as of yet.
I am tempted to try doing a trielemental as you describe once I get a few more levels and gear.
My main question at this point is how does one properly manage desync? If I use it to switch to tock, my next turn is just going to be another tick unless I am missing something. I am not sure when to use and when not to use it.