Remotely disabling RTC battery charging

TX2, using Jetpack 3.3 and L4T 28.2.1

I do not have physical access to the devices that I need to update.

I have tried to follow the instructions at Deactivating RTC Battery Charging.

I am able to remove the device tree node indirectly by modifying the kernel to not load that node. [1]

But as far as I can tell, the tegra186-mb1-bct-pmic-quill-p3310-1000-c04.cfg file I change modifies the mb1 bootloader, which I am unable to update remotely. Is there a way to do whatever change the pmic configuration file does, but in the kernel (or some other remotely accessible part of the system)?

[1] I do this by modifying the max77620_init_backup_battery_charging function in max77620.c [2]
[2] the /sys/kernel/…/registers file shows that the 04 register is set, at least.

Could you help to refer to the following instruction for image based OTA to do this remotely?
Over-the-Air Update - Updating Jetson Linux with Image-Based Over-the-Air Update

and you could modify the configuration file before generating OTA package.

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