I also agree with making another unsalted batch & combining the two. Also, once the overly-salty batch is frozen & thawed again, it won't be quite as salty as it was before. Probably not "edible" unsalty, but less than it was fresh. Freezing tends to do that to seasoning.
But really - the "add an unseasoned batch to the salty one" is a terrific idea. Just mix them all together & freeze them in family-size portions.
I made the same mistake you did more than once, only with crushed red pepper flakes. I opened up the "spoon out" side of the container instead of the sprinkle side, & out came about a cupfull of crushed red pepper. Just like you, I scooped out as much as I could, but man, was that chili HOT HOT HOT - lol!!!!