Hi Stefano -
The retractables all feature a secondary black backing layer, so your library wall (or flat panel, or white speakers) won't affect the image.
The XD is evolutionarily better than the CP2 in every performance metric, but since you're after a significant improvement and mentioned texture, I'd go with the UF.
Enlightor-4K is the only randomized weave AT material, and has no minimum seating distance. It's used at mastering studios as close as on the other side of the mixing console (~1m). It has no frequency or phase effect with a flat -2dB attenuation across the frequency spectrum below ~30kHz. It would be available to you only through Screen Excellence at the UK division, and they have distributors throughout the EU.
The Center Stage UF is not a randomized weave, it measures about +10% higher gain than EN-4K (and -20% from XD), and has a whiter look. It's good at ~1.5m further, so you're fine here.
We service customers directly, hence our ability to price the product at a factory-direct price rather than through the distributor/dealer model. The logistics of customs clearance is handled through UPS. I don't know what your non-delivery fees would be in addition to the product, because all countries are different. I'm sure your local network of AV enthusiasts has had some experience bringing in US product?