The electric fans, are not a good idea. Most of the time they are not designed for a harsh environment like a engine compartment. They may move "some" air, but an engine moves a very good volume of air, and we could do the math, but at a point, the fan becomes a restriction to flow.
Super- turbo charger? The actual early name for a turbocharger is a superturbocharger.
From Wikipedia - "Early manufacturers of turbochargers referred to them as "turbosuperchargers". A supercharger is an air compressor used for forced induction of an engine. Logically then, adding a turbine to turn the supercharger would yield a "turbosupercharger". However, the term was soon shortened to "turbocharger". This is now a source of confusion, as the term "turbosupercharged" is sometimes used to refer to an engine that uses both a crankshaft-driven supercharger and an exhaust-driven turbocharger, often referred to as
twincharging."
Now, twin charging. Its been done. Its interesting. Expensive and complicated. They are interesting design exercises , but honestly not worth all the hassles.
I was in the US Navy for 6 years, and I worked on control systems for Detroit Diesels. 16V149T. Those are 16 cylinder in a V configuration , 149 cubic inches per cylinder , turbo charged. Actually they were twin supercharged, and quad turbocharged. Two superchargers feeding each supercharger. 2 stroke, noisy, nasty thing that Detroit. It did make about 1700 hp, and turned right on about 1800 rpms to make 1000 kW of power. They work, they are common, but complicated.