Did it here and it worked!
So explaining for other people that might want to do the same.
First my OPPO 203 is on custom firmware, so it can read BDMV and ISO from USB and LAN.
How it worked inside Windows 10.
Using HaneWin NFS you can export the mounted drive but no files are visible.
Using SMB you can’t share the mounted drive and using junction, symlinks won’t work.
What I did is:
Used VMWare Pro to boot a Ubuntu 18.04.
Bridged the network so it has it’s own ip address within my home network.
Tried NFS, it can see the folder but not the files. Someone mentioned that converting the fuse file system would work, I have no idea how to do this and seemed really complicated.
What worked is creating a SMB share, sharing it with the OPPO 203.
OPPO can see all the files and I was able to play a full disc BD UHD from Gdrive.
To me this was amazing.
The only caveat is that OPPO for the love of me, can’t use any user and password.
Tried everything and it worked from within windows 10 and it worked, but the oppo must have some bug that prevents it from using a username and a password.
Reading in the unofficial FAQ it claims OPPO uses SMB 1.0 so maybe the authentication is different.
What I did was make my mount point public and accessible by a guest account.
If someone knows how to make it access using a smb user and password, let me know.
But I call it a success and to me this is amazing.
My next step is try to play some games from gdrive, maybe some old games like Diablo cold be done, from within windows it’s not possible even setting folder and files permissions to 777.
Maybe from a share in linux it would be possible.