I did the headliner in my MK3 and just used a thick polar fleece type material with no foam. Came out looking more OEM that the stock one did (at least in my mind).
I wouldn't be too worried about foam backed, if you're really keen just put a layer of soft material down first, then attach the suede to that. Although I suppose you are putting in an extra point of failure with a second layer.
Damn Headlining
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