It will also trial 20-minute sanctions for red cards and a shot clock for scrums and lineouts, as per Super Rugby Pacific.
Both teams have loose forwards out to impress new coach Scott Robertson.
The reigning world champions were rocked by archrivals England in their last outing.
All Black dad Jamie Joseph won't be in the stands for his daughter's first test cap.
The 11-year veteran was part of the Tokyo Olympics gold-medal squad.
Vaipulu and Joseph will become dual internationals, when they start against the Americans.
All five New Zealand Super Rugby teams are playing in round 12.
At 2-8, the champions can use all the help they can get.
The proposal will be put to vote at a special general meeting on May 30.
The teams will square off for the No.1 spot atop the standings at Eden park this weekend.
Meanwhile, the All Blacks Sevens also won their final against Ireland.
Meanwhile, the All Blacks Sevens will also contest the men's final against Ireland.
"It's going to take a wee bit of time."
The NZ women face Fiji for a place in the women's final, while the men take on Australia.
The win was their biggest over the Western Australians in Super Rugby.
The result is a major setback to the champions' hopes of making this season's playoffs.
But the victory came at a toll, with injuries to some key players.
Meanwhile, the NZ women reached the final eight without defeat in poolplay.
The game was played in torrential rain that made handling difficult.
The defending champions suffered a major setback in their bid for the playoffs.
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