Lab Setup

Boot the physical computer into a linux system.
Export the disk device via nbd
First make sure that nbd server will not try to set user and group to nbd by editing /etc/nbd-server/config and removing the relevant lines.
Then export the block device on port 2000: nbd-server 2000 /dev/sda -d
Now into your image server, make sure you have both source and destination nbd devices connected:
Connect the local source disk as nbd2 with: qemu-nbd --read-only -n --connect=/dev/nbd2 /mnt/data/virt-storage/lakatkft-win10.qcow2
Connect the target disk as nbd3 with: nbd-client 192.168.222.85 2000 /dev/nbd3
Understand the size of required target partition and create the partition:
In my case size is 51607MiB in my case
and partition is /dev/nbd2p4
Create the partition on target with at least the same size mkpart WIN NTFS 40960MiB 94000MiB
copy data between the two partitions dd if=/dev/nbd2p4 of=/dev/nbd3p3 bs=64K conv=noerror,sync status=progress
Do a sync so that data is flushed:
sync
Disconnect source block device qemu-nbd --disconnect /dev/nbd2
Start a VM with windows 10 install cd that has /dev/nbd3 as a SCSI block device.
Fix boot partition from within windows
Start the fixer VM
Once booted up, press Shift+F10 to get a command prompt
diskpart
select volume 2 (The EFI Partition)
assign letter R
exit
bcdboot c:\windows /s r: /f UEFI
Exit the installer and shut down the VM
disconnect target block device
nbd-client -d /dev/nbd3
reboot target machine