I can think of 2 additional suggestions -
First, you can create a control with two sets of buttons by customizing the classic slide, which has buttons and a digital display. You can "disappear" the slide itself and leave only the buttons and the digital display. I'm not sure how it would hold up to resizing and the two sets would have the same behaviour, but it's 2 sets.
Second, if you're already doing all this playing with property nodes, you could try creating fake buttons. You would have to use mouse down to detect where you're clicking on the control and determine the control's value this way. You can have a subVI to do that. Make sure you use LV images to get the resizing done correctly. Once again, not perfect, but at least it's one control.
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