Is re-doing Superman really that great an idea though? Keep in mind the structure will have a design lifespan, and it's already 30 years old.
Extending the life might require significant structural assessment and intervention or remediation works, before you think of adding on new loads and effects from a new attraction.
And, really, what are the possibilities here, keeping it cheap? The structure is so chunky but so linear, that you'd have to be doing anything interesting down the bottom end - it's a long launch track, but it probably still needs the majority of it even with modern tech - it doesn't leave a ton of room for anything interesting unless you move back into the midway (other than doing a top hat to link the two sides, like the video above, but that seems tricky too).
I'm not sure this is the way forward.