Easy way to solve lore not the best way
So I had a random idea one day about the easiest way to fix the lore but it kinda feels shallow and disappointing.
All of the champions are people based in the past of the world and now all you are summoning them to do combat to solve wars of the present world.
This would let you kill off characters and provide actual story development through historical finds and allow for multiple legends because no one can actually know what is in the past so every lore can be connected plus different legends of the same champions can crop up.
For example the Frost King Trundle and The Plague Bearer Trundle.
TLDR Turn league champions into historical figures in the world and have people summon them to solve the futures problems.
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