I would recommend Apex extracts to get the flavors you're looking for. All of the flavor, none of the downsides.
https://www.apexflavors.com/Beverage-Industry/Craft-Brewing
Dumping Oreos, Skittles, Fruity Pebbles into beer is a fun story to tell, but when you end up with 5 gallons of crap, the...