I don't have specific knowledge to offer, but a general theory/suggestion.
have you tried a reflective material? There's a Reflective section in the material presets with many options, one of them might give the realtime reflections you desire, and you could just apply it to a flat panel. if you've not tried, it can't hurt to give it a test, won't take you a few minutes =) i'd be curious how it goes for you too
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