Nice list! I would add Phil Manzanera's K-Scope which like Southern Cross featured Tim on lead vocals for a few tracks. Other Enzers were also involved. Mark Hart was a member of Supertramp for a few albums before and after Crowded House.
Neil was featured prominently on several Dave Dobbyn albums including as producer and co-songwriter on Twist.
Phil contributed music to a movie called Amy in 1997 but I don't know if the soundtrack was officially released.