Thanks for the link to the weak Aura, it gives me some idea.

I actually used for my rogue the same type of cast sequence as you gave. It is surprisingly not too far from doing myself the rotation.
For the proc based rotation, i for now use a guesstimate on how long it should take to get a proc. for intance on my mage FROST, i will cast all the CD item and then few basic frostbolt and then flurry and ice lance, hoping for a proc... This one is pretty low compared to the real rotation.

Anyhow, i am not investing too much time now on this, because of the class change. I will go on the PTR once the pre patch is announced.