OnePlus 13 Root-Unroot Method Without Reboot

Title: OnePlus 13 – Root/Unroot Without Reboot & Uptime Preservation

I have a OnePlus 13 running a downgraded software version. The device is rooted using a process involving USB debugging/ADB, Fastboot commands, and a reboot.

My main requirement is to develop a reliable method or modification that allows the device to transition between rooted and unrooted states without requiring a full device reboot, while keeping the system uptime unchanged.

Currently, after unrooting, the required reboot resets the Android uptime, which is undesirable for my testing setup.

Requirements:

- OnePlus 13 compatibility
- Support for my current downgraded OxygenOS/Android version
- Root/unroot state change without a full reboot, if technically possible
- Preserve the existing Android uptime
- No data loss or factory reset
- Explain the technical limitations and risks clearly
- Provide installation/use instructions and source or modification details where possible

This is for device/software testing and research. Please mention your experience with Android internals, ADB/Fastboot, Magisk/root, and Android system services.