I'm not sure it would be a good idea. It would just be like finding a party to go through ramuh or levi hm. People who have already cleared them wouldn't be interested. I'm not even sure that a story mode coil could still be considered a "raid" if they eased it as suggested by OP. They could turn it into solo-quest then or just add coil cutscenes to your diary so you can watch them with your character.

Maybe, it would be different if they designed it to be like garuda ifrit and titan hm where you can still wipe if the party doesn't know what to do.
But these are just my 2 cents ..