I just got one of these Lexar F35 drives. It was about 30 bucks. It might do what you need. Some things: 

- It does require Windows to set up, unless someone smarter than me can make it work in Wine. The app seems simple.
- Fingerprint programming is easy and fast.
- Users get assigned roles as admin or "other users." Admin can add and remove users. All get access to secured partition.
- The app lets you choose the size of the secured partition. I got a 64GB drive and it will partition all of it secure if you want.
- It unlocks the secure partition on Windows and Linux.
- I could NOT get it to unlock secured on Android phone (Pixel 8). Tried external powered hub, also. 
- I abused it a little by yanking it during write, startup, etc. and it didn't lose anything.

If you want me to try anything else, let me know.  

 Thank you! Is it possible to setup multiple users that don't see each other's info AND that the admin doesn't see their info as well? 🤔 

 I don't think so. All users who have a fingerprint enrolled can see the secure partition. Any of (I think) 10 fingerprints gets you access to the secure side. They can be 10 different people. The only elevated privilege for admin is the fingerprint add. It's very simple. I'd bet it's hackable, but that's way out of my league.