The proposal will now be sent to the current Class 6A schools for a vote, with a simple majority needed to accept one of the two options.
The changes would not go into effect until the 2014 season, because districts are already set for 2013.
Either proposal would create a three-week postseason.
OSSAA executive director Ed Sheakley said no decisions have been made regarding a possible bye week to keep the 6A championship games on the same weekend with the Class 5A and 4A title games. However, Edmond Schools athletic director Mike Nunley said the consensus from 6A coaches and athletic directors who met last month was to avoid having a week off in the postseason.