the best way to do that would be making it school policy to issue transcripts with any grades you want any time after you finish your degree. set it up so theres no difference between one you got at graduation and years later. even if you never request one the fact that its possible makes it so treating everyone from that school equally is the only rational option.
but for that to work all the schools in a state would have to use the system so employers cant be like "you graduated XY university? thats the one that lets you fake grades right?" and treat you like you got a 1.0 GPA. we need to get the government involved.
or if you want a less radical/more realistic solution let people retake classes after they graduate to retroactively get better grades. the point is some number on a piece of paper you get in your early 20s shouldnt be visible and affect the rest of your life.
Another issue is with the curriculum and course structure, which should long been updated. But that's another rabbit hole on its own, especially in public universities with a big hierarchy of system. The sad truth is professors have no passion in teaching outdated curriculum, and students have no desire to learn.