Shizuka doesn't require a rooted phone to run, it has to be re-enabled each reboot.
I don't believe what you're asking for exists, but I hope we can find a solution for you nonetheless!
Maybe try a virtual machine with an Android image and see what you can do from there instead. You can run pure Android disc images (.iso) from virtual machine emulator software. This way, you can edit and even root the Android installation all from the comfort and safety of your virtual machine and it can be easily deleted at any time. This will help you bake in anti-DRM or screen protection, or at least use root to disable the protection itself. I know there is a Magisk module already available for taking screenshots in protected apps.
Apple Music on Android has this same implementation, where if you screenshot a music video the screenshot comes out completely black and blanked.
I don't know the end answer, but I believe your starting point is a rooted Android, and if this isn't possible, use the root replacement that works on most devices, the SnapEnhance works without root and even gives free SnapChat Plus as an added bonus. Shizuka is a root replacement and a Magisk replacement. Magisk modules for DRM or protected view or screenshot protect may guide you in the proper direction, godspeed sir!
Wefwef.app has got to be the most stable for most and myself.
I believed Germany, whatever the VPN lands on right? Let's take a spin, shall we?