I'm the OP on this and have an update worth noting. The Costco 100% peanut butter I use is smooth. No crunchy and I like crunchy. Now, you can buy Smucker's 100% PB that's crunchy but it's not always available.
So, we got some jars of dry roasted unsalted peanuts on sale and an extra two empty jars to handle the combined product overflow. We split the Costco creamy PB into three jars so we had space, got a plastic bag to smash the nuts in and a kitchen hammer. I smashed the nuts into pieces and added them to the plain PB. Actually starting the jar with crushed nuts first and then layering back and forth up to 3/4 full with smooth PB worked the best. Then, hit it with the electric drill to mix. We found the more added peanuts the better. Go crazy. Commercial crunchy PB is woefully lacking in added nuts and too much salt.
So, I now have crunchy PB to my specs, PB and strawberry sandwiches at my command and a smile on my face.
Note: when you crush the peanuts, put in a big zip-lock bag and whack away. Do it without the contained bag and 98% will be on the floor and 2% somewhere else. You don't have to zip the bag shut and start with smaller amounts.