public class MioOggettoConScadenza{
[...]
public Disable { 
{
 get{
   return this.MyTime.TimeOfDay > DataTime.Now.TimeOfDay;
  }
}
}

var miaLista = new ObservableCollection<MioOggettoConScadenza>();

private void dispatcherTimer_Tick(object sender, EventArgs e) {
  foreach (var mioElem in XamlElements){ //XamlElements rappresent gli elementi in binding creati in una ListView a runtime e ognuno collegato con DataContext impostato ad un'istanza di MioOggettoConScadenza
    BindingExpression be = mioElem.GetBindingExpression(mioElem.MiaProperty);
    be.UpdateTarget();
  }
}

public async Task ForseUpdateDisable(){
  NotifyOfPropertyChanged(() => Disable );
}

private void dispatcherTimer_Tick(object sender, EventArgs e) {
  foreach (var elem in miaLista){
    elem.ForseUpdateDisable(); // Non credo serva await, anzi
  }
}

timer = ThreadPoolTimer.CreatePeriodicTimer(async (e) =>
            {              
                foreach (var oggettoCheCambia in MieiOggettiCheCambianto)
                {
                    await oggettoCheCambia.UpdateTimerAsync();
                }
            },
                TimeSpan.FromSeconds(1));

public async Task UpdateTimerAsync()
        {
            NotifyOfPropertyChange(()=> RemainingTime);
            NotifyOfPropertyChange(() => Disable);
            NotifyOfPropertyChange(() => TimeExpired);
        }