How much are you into programming and tinkering?
You may be able to make an xposed module to convince the dji app that you use an “investor approved” operating system.
First you would need to reverse engineer the dgi app a little, to find out where in the code it checks for your system, like when does it use safetynet. If it prints an error message or logs something to logcat when it refuses to work, then it could be easier to find the place starting from that point and the stringcs appearance in the code and usages.
Fortunately, even it not too easy, android apps are among the easiest to reverse engineer. The 2 major tools that will help you are jadx (the decompiler) and Android Studio (the official android dev program for helping in navigating the code, most important features are finding usages of a function or string resource, and “refactoring” so mass renaming functions when you understood what does a key function do)