removing 'md' device from a qcow2 image

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I have been given the following qcow2 image.

root@nvc-t2-227:~# qemu-img info ./img.orig

image: ./image.orig

file format: qcow2

virtual size: 800G (858993459200 bytes)

disk size: 8.5G

I need to shrink the virtual size to 50G.

Unfortunately, the qcow2 image has a raid array inside it as a result of which virt-resize fails.

root@nvc-t2-227:~# qemu-nbd --connect=/dev/nbd0 ./img.orig

root@nvc-t2-227:~# fdisk -l

root@nvc-t2-227:~# fdisk -l /dev/nbd0

Disk /dev/nbd0: 800 GiB, 858993459200 bytes, 1677721600 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: 280F7B6B-E02A-41BA-9FA8-258C021EA06E

Device        Start        End    Sectors   Size Type

/dev/nbd0p1    2048    1050623    1048576   512M EFI System

/dev/nbd0p2 1050624 1637091327 1636040704 780.1G Linux RAID

Is there a way I can shrink this qcow2 image?  

virt-resize cannot handle the software raid 'md' interface.

I am fine removing the raid interface and shrinking the image to a smaller size.

How can I achieve this?

Thanks,

Fred.