SD Card Boot + USB for storage

Hello,
I have VIM3L HTPC Kit, which has CoreELEC preinstalled on the eMMC.

If I want to run CE from the SD card (flash) and use USB stick to /storage, what procedure I should follow?

I should be able prepare SD card as usual (Rpi, Odroid). I assume for storage I just need to change disk= within /flash/cfgload or simply change label on eMMC from STORAGE to something else and label USB stick partition as STORAGE, right?

But I read on wiki, that for SD card boot there must be android on eMMC? I am not familiar with eMMC control operations and I dont want to brick my deviceā€¦

What if I change
setenv rootopt "BOOT_IMAGE=kernel.img boot=LABEL=COREELEC disk=LABEL=STORAGE"

to
setenv rootopt "BOOT_IMAGE=kernel.img boot=UUID=<UUID of SD card flash partition> disk=UUID=<UUID of storage card flash partition>"

on eMMC /flash, will it work without Android? That would be less aggresive change, and quite clean also, but I am not sure about future update processā€¦

Thank you!

VIM3L:~ # parted -l
Error: /dev/mmcblk0rpmb: unrecognised disk label
Warning: Error fsyncing/closing /dev/mmcblk0rpmb: Input/output error
Retry/Ignore? i
i
Model: Generic SD/MMC Storage Card (sd/mmc)
Disk /dev/mmcblk0rpmb: 4194kB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

Error: /dev/mmcblk0boot0: unrecognised disk label
Model: Generic SD/MMC Storage Card (sd/mmc)
Disk /dev/mmcblk0boot0: 4194kB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

Error: /dev/mmcblk0boot1: unrecognised disk label
Model: Generic SD/MMC Storage Card (sd/mmc)
Disk /dev/mmcblk0boot1: 4194kB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

Error: /dev/mmcblk0: unrecognised disk label
Model: MMC AJTD4R (sd/mmc)
Disk /dev/mmcblk0: 15.6GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags: