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As long as there are no stipulations in the separation or divorce agreement requiring you not to change your will then you are permitted to do so. A will is not normally considered part of a divorce settlement as this is used for when you die........presummingly after the divorce.
Yes you can request that the home be sold and split between the children. Even though the divorce is not final you may change it as you see fit. If the divorce agreement changes anything you had in your will you may simply update the will to reflect these changes.