Thanks for your help!
final price was ~£120 (part + shipping + customs)... so a bit expensive for such a small and simple part... but for me it was the way to go! I'm very happy with the final OEM look!
I've removed 9,3 kg from the car (full stereo delete + antena) and can brag about having an unicorn part on my NSX!
here is a picture of it 9,3 kg lighter than before :