How to mount smb network shares to android systemwide with write permissions?

Hi @ all, at this point I'm pretty desperate.

So I got myself a Nvidia Shield Tv, it's the most powerful android tv box atm, for those who don't know.
In android system settings I can mount network shares, which is great!
BUT I only have read settings this way. I know it's intended by nvidia, for security reasons. Currently only 2 apps can get write access to mounted shares, emby and plex...both of which I don't use. Of course apps with built in smb client can write to the share but I'd like it to be possible systemwide for every app.
For example, titanium backup app currently backs up to a plugged in usb stick but I'd want it to back up to the network share.

I couldn't find much help over at shield subreddit, nvidia forum or Shield Tv section here.

Does anyone have an idea how I could archive write permissions on mounted network shares? I'm rooted using magisk. I could also use xposed modules if needed.
Only one answer from nvidia made sense, saying I'd have to build my own image with custom fstab file... but idk how to do that+ I don't wanna do that.

I still think there has to be some other, easier way, especially with root.
I'm not fixated on the mount way in the system settings of nvidias android tv implementation, just any way on the shield to mount smb shares systemwide would be great. So that every app will "see the shares as local hdd's". Hope you know what I mean.

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