Is it permissible for the fiancée's brother to be her guardian (walī) in the marriage contract, if her father and paternal uncle refuse to marry her off after promising to agree?

The father's actions are contradictory, as he agrees to the marriage and then threatens. If the father's obstruction is proven, his guardianship falls, and it transfers to the judge or the closest guardian (such as the brother), while observing obedience to the father in what is good.