"...because 8 screens worth of footage (Even if it just using two Gamecubes) would be rough to watch." Is there no way to get 2 players on a kart?
There is, but only the person in front drives. The person in back uses items and enables the blue sparks when drifting, although you swap back and forth if you want more than one item. If we did that though, we'd have 2 screens per Gamecube for racers, which would give us four video feeds of two karts each at the max.