Properly formatting SD for Marshmallow

Hello,

OEM's rom doesn't handle ext4 for external storage and asks for reformatting to exfat, telling it is "corrupted".

Manually creating an exfat first partition and a second ext4 partition doesn't work to vold mount the partitions, but mounting manually works for using the filesystem, yet the system aggressively asks me to format the whole storage.

How should I proceed to format "correctly" my sdcard to make vold stop ask me to format, yet keeping a whole storage ext4 partition, or a small exfat partition and a big ext4 partition.

On device tools that touches /system are outright banned as it will break safetynet stuff. (But root is available)

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