Yes, is possible.
I can't test myself at the moment. So better be sure that you have a full backup and that you don't have any important data on the SD card!
ofgwrite -n -m0 -ksda0 -rsda1 <path to image files>
The -n parameter is for a test. You can look at the output and your box won't be flashed.
Important: Exchange the sda0 with a kernel partition on the SD card and the sda1 with a rootfs partition.
And please don't change the -m0 if you want to flash partitions on the SD card.
If you're sure that the output looks good, you can flash by removing the -n parameter.