I was able to update this morning. I got home and was able to use the wug toolkit. I flashed back the stock recovery, flashed the stock kernel. Then was able to allow the update to jss15r, then flashed the updated custom twrp recovery, flashed elementalx back and I'm all good to go! Flashing stock recovery probably did it for me, not too much of a hassle. I was thinking I was going to have to do a full wipe...
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