BONJET ATELIER SUPERMETALLIC GLOSS's paper base is a bit too blue / gray and the metal effect is not impressive.
Look rather to the Sihl Masterclass Metallic Pearl High Gloss Photo Paper 290 gr. which is the paper I know that most closely resembles the effect was in Cibachrome paper. So best metallic effect and the paper base has a neutral trend over the slightly warm nice paper base.
I have tried metal paper from Moab, Bonjet, MediaJet, Sihl Masterclass and in addition to the extreme Moab Slickrock Silver, Sihl is what I prefer.
However, MediaJet SIP Silver Iridium Pearl is also an interesting paper for B/W prints.
If you live in Denmark or Scandinavia, you at Iversen Company can buy A4 test sheets at a reasonable price. I myself have been happy to be able to test new papers in this way, instead of buying a whole package of only two sheets of each test paper.
https://www.iversen.company/produkt-kategori/testpakke/