Wicked can be compacted into a 30 minute show that effectively tells the story of how Elphaba became the Wicked Witch:
No One Mourns the Wicked - Opening
Narrate/Act introductions at Shiz and move straight into What Is This Feeling (Loathing).
Narrate/Act passage of time and move straight into Popular.
Narrate straight into One Short Day.
Act a shortened Wizard reveal/Elphaba rebels.
Defying Gravity finale
That is the actual Wicked Witch origin.
It's a theme park show. Cut Tessa, Fiyaro, Boq, Dr. Dillamond and everything AFTER Defying Gravity and you'll have something that is fine for a theme parks. Losing Dancing Through Life and For Good sucks, but Dancing Through Life can turn into a nice, up-tempo curtain call. The entire second act is too heavy for a theme park (Hi, Into the Woods!)
Most importantly, from a cost perspective, you'll only need two featured singers. Everyone else will use a heavy sweetener track.