My client wants the out of stock options to show, which is why I'm struggling with this. She wants the SIZE variants to be bold where they're available. I will try the table option now to see how it's displayed, but the layout you're seeing right now is pretty much how it has been requested to look like...
EDIT: I tried it and it comes out like this
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. I'm not particularly disliking how the concept looks, but as you can see it looks a bit disorderly...