I don't see any problems managing the procs on my 3 dps at all. It will be very easy to manually switch between the different cast macros. All I have to do is watch the 3 dps closely during fights and simply make 6-8 buttons to manage the proc.

*Just kidding*

Ill try to setup the stuff in innerspace, and see if I can get it to work... I can imagine it would take some serious hours of practice. But as im able to clear out all instances without the proc so far, it can only improve.
I know when I need to do heorics etc. it will be a problem. But practice makes perfect and Nolife got very far with just spamming wrath+moonfire (see his vids).