Mine says Alpha so I assume it's an alpha dupe? I tried a Furls streamline and it looked exactly the same to me, so I'm not exactly sure on the hook or handle differences between the different lines. If you look on Amazon at Divit Shilp a few different listings come up, including ones that say Streamline. For me they come up as free shipping and free returns- after hating one kind of ergonomic hook and hating it I decided to test out a few and see if I could find any I liked, but $20+ single hooks when I tend to use a lot of sizes was beyond my budget. Ommi came up as another similar shaped brand but I haven't tried those out. You could potentially try out a few dupes and return what doesn't work for you.
I did find out I'm not a fan of wood (or plastic) hooks, so I'm sticking with resin and metal. And I figured out I hate basically any plastic or faceted handles, so for me handles are limited to round shapes in wood, metal, and resin. I'm hoping Furls Odyssey's restock some smaller sizes to try those out because I think that's the only Furls or dupes I've found under 4mm?
This is the link to the hook I got: