Correct me if I'm wrong but the DSU images are essentially an entire image that you can temporarily flash into free space residing on your device. Once booted into you can do as you need troubleshoot or test or whatever the case may be, but as soon as you restart the device will go back to whatever OS is currently installed in this case, GrapheneOS.
If this is in fact true and accurate, what I was hoping to accomplish was to temporarily flash the Stock OS that's shipped with device.
In doing so, one could for example use any or all features that do not currently exist in GOS; Android Auto, Now Playing, Call screening, Google Pay, etc.
Then, once the user has finished whatever it was that they needed to do, reboot the device and now you're back in GrapheneOS.
Is my understanding of DSU Loader correct and would this be possible, theoretically or otherwise??