Avoid unchecked cast in ChoiceBox that populates from Enum

Question

I wrote the following custom ChoiceBox that populates itself from a generic Enum implementing my interface DisplayName below:

import java.util.Objects;

import javafx.scene.control.ChoiceBox;
import javafx.util.StringConverter;

public class EnumChoiceBox<T extends Enum<T>&DisplayName<T>> extends ChoiceBox<T> {

    public EnumChoiceBox(Class<T> enumType) {
        super();
        getItems().setAll(enumType.getEnumConstants());
        this.setConverter(new StringConverter<T>() {
            @Override
            public String toString(T object) {
                return object.toDisplayName();
            }
            @Override
            public T fromString(String string) {
                for(T t : getItems()) if(t.toDisplayName().equals(string)) return t;
                return null;
            }
        });
    }

    @SuppressWarnings("unchecked")
    public EnumChoiceBox(T defaultValue) {
        this((Class<T>) Objects.requireNonNull(defaultValue, "defaultValue must not be null!").getClass());
        setValue(defaultValue);
    }

    public EnumChoiceBox(Class<T> enumType, T defaultValue) {
        this(enumType);
        setValue(defaultValue);
    }
}

public interface DisplayName<T extends Enum<T>> {
    public default String toDisplayName() {
        return this.toString().replace('_', ' ').toLowerCase();
    }
}

Basically, everything works and the complier is also satisfied with the first and the third constructor. However, it seems to me that the two arguments in the third constructors are unnecessary: it should be enough to pass the default value as this already contains the class information.

So, this is what I tried to achieve with the second constructor, but there I get a warning that I made an unchecked cast. Is there any way to solve / get around that problem (other than just suppressing the warning)?