Hello!
Im trying to find a solution too and I stop on your resolving way: static 
boolean in the widget and injection by StyleInjector. But invoking 
"StyleInjector.inject( style.getText(), true );" force inject styles and after 
few moments styles injected again! It happens because 
"uiBinder.createAndBindUi(this)" invoke "style.ensureInjected()", that invoke 
"StyleInjector.inject( style.getText(), FALSE );" that add style injection to 
the queue in the "StyleInjector". Fortunately StyleInjector provide flush() 
method... 
And final solution is:

@UiField
Style style;

private static boolean styleInjected = false;

public SomeWidget() {
        widget = uiBinder.createAndBindUi(this);

        if (!styleInjected) {
                styleInjected = true;
                StyleInjector.flush();
        }
}

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