Jeansmagig is a plastic thing that helps presser foot go up and over the thick seam. Goggle, you might see it used.
Family member had an alteration business & she would pin jeans hems in place then take it out to the sidewalk and softly pound the seam kind of flat, (note: I said “kind of flat”) to help sew over it. I was successful once then next time I made a hole in the fabric ! Yikes ! Pound at your own risk !
There are You tubes about taking a tuck above the hemline then trimming off the tuck. It keeps the original hem. Done that, I got some strings hanging down but I trimmed and after a couple of washings, didn’t bother much anymore.