So basically the worse the PC you got, the easier this gets xD. Does this work by setting the dialogue boxes up in advance, or do you just need to be as fast as one can be hitting the different buttons during the autosave?
You don't need a bad computer for it.
1. Play Austria or any other country normally/get emperor/get some land to add to HRE
2. Get to late December (~28th) or turn on autosaving every month and get to late in that month (I do anually because it's hard to remember the # of days in every month)
3. Get a CPU stressing program, like Prime95 and an autoclicker macro.
4. Turn on Prime95 and get back into EU4 very quickly (if you do not EU4 will take a LONG time to tab back into), turn on autoclicker.
5. Get ready with the autoclicker on over the add province button, go to speed 4. Should be quite slow.
6. Jan-31/dec first hold down the macro, and press enter as fast as you can. (You could get another macro for enter if you wanted but I get 100 IA just with 1 macro for left click and enter by hand)
7. Repeat 1-6 for every province until Revoke The Privelgia. IIRC going this far stops italy from leaving the HRE.