Except, I can’t recall the last time I rode DCR when these weren’t shut off and used as nothing more than weirdly shaped cubbyholes. Which, IMO, would be the major issue with anything that’s mechanical & not necessary for the ride to operate, no matter how simple or complicated it may be, it’s upkeep will fall to the wayside & be replaced by (or used as) a system that doesn’t need any extra attention/care to operate.
In the event of a Superman overhaul, and under the mutual assumption that they weren’t to keep the separate load/unload station, I’d imagine the loose article system they’d opt for would be similar to Leviathan/Steel Taipan/Storm: A bin/wall with compartments for riders to store their loose articles, with a sliding door that covers at least half of these compartments at all times, which may or may not be slid across by a ride operator between dispatches.
In the scenario that they overhaul Superman, but keep it’s load & unload stations the way they are, I’d again imagine that they’d shy away from an overly complex system like on Yukon Striker, instead opting for the significantly simpler setups like what’s on Velocicoaster/Steel Vengeance/Jet Rescue/Motocoaster: Right before boarding, loose articles are placed into a double-sided cubbyhole or (free) locker, and are retrieved from the other side via the ride exit path.