While fucking around with console commands in EU III, I discovered an actually quite cool way to create a "Semi-Random" save. Heres how I did it:
Step 1: Choose a random nation. Perferably an OPM or other nation without a whole lot of cores.
Step 2: Open the Console and use the "annex [TAG]" command to annex every country. (Well, you don't need ALL of them, you just a sizable chunck of the earth.)
Step 3: Bring your stability down to -3 and set infamy to something ridiculous. (Helps Revolt risk)
Step 4: Release one nation (Again, perferably an OPM) and switch to it via the "tag [TAG]" command. This is to make sure you don't get completely spammed by revolt messages.
Step 5: Sit back an Enjoy as
everything revolts.
Step 6: When all the revolters have declared independence and occupied all of the Provinces that the nation you selected owned, switch to it and make peace treaties giving the revolters all the land they occupied. Don't forget to use the "tag" command here to make sure they accept and the "Infamy -" command to get rid of all the infamy the revolters will get! (Make sure you save the revolter occuping your capital for your annexation!)
Note: That Yellow in Scotland isn't actually Scotland. Thats Gaelic Highlands.
It should be noted that I did this with D&T, but it should theoretically work with any verison of EU III. It takes quite a lot of time and effort to pull off (It took 2 hours for me!), but it can end up pretty fun if you do it right.