Is there any Thok 25 HC rotation manager for randomraids/pugs?
Some addon or list or website where you feed it with the roles you have in your raid.
Just declare that you have 1 retri, 2 heal shamans, 2 discipline priests, 2 warriors, 1 enhancer .... and you get a final list, which shows when to use what kind of raid cd
I doubt that there is any site or add-on which does what you ask. All I could fine after using my google-fu was an addon, which just announces CDs you set up before the fight...
But in general as long as you know what class can offer what CD it is not tough imho to take a 5 minute break before Thok and just sort out CDs yourself, if you have rough idea what amount of dmg will be expected when.
Blood Legion CD Tracker will show you what CD's you currently have in the raid, how many are up, and the timer on them
After that it's just common sense when to use which