no; the uncontested divorce would have to be withdrawn and someone would have to file suit for divorce.
The attorney for the uncontested divorce could not represent the opposing parties.
As long as the attorney remains the attorney for both parties in the uncontested divorce, I suppose he, or she, could make promises to one party--like, I promise the $1,000 in savings will be divided equally into shares of $500 each.
What kind of promise are you talking about?