If you had the time and inclination, you could install -current onto USB, and then experiment with the eMMC disk as the second mass storage device.
If nothing else, a GENERIC or GENERIC.MP -current dmesg would probably be welcome by those making revisions to sdmmc(4) and related drivers in the chain.
What was posted in the thread you reference in your top post was a 6.3 RAMDISK dmesg.
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