As a pre-eminent clergyman from a notable family, it was self-evident that Evert should function as a member (and occasionally chairman) of the First Estate (clergy) of Utrecht. He used his political weight to support the Bishop-Elect Gijsbrecht of Brederode in his struggle against the Burgundian candidate for the see of Utrecht and was later a staunch supporter of his brother's anti-Burgundian policies. He accompanied his brother on his embassy to the Archduke Maximilian in September 1481 as the representative of the First Estate of the Sticht and was amongst the most prominent of the Hook leaders who were captured during the coup d'état of 21 April 1483. His devotion to the defence of the Sticht's old privileges was so intense that he personally subsidised the recovery of Utrecht's lost war-materials from IJsselstein in 1482. He nevertheless reconciled himself with Bishop David of Burgundy following the siege and surrender of Utrecht in late 1483. Bishop David formally forgave him all that he had done against him in April 1484, and Evert remained one of the most prominent clergyman in Utrecht until his death twenty years later.