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The external sd boot mentioned in the link still relies on a working bootloader on the internal storage. That bootloader (u-boot) will load the kernel in memory (again from the internal storage) and jump at it. What changes is the root cmdline argument passed to the kernel.
That means that you'll need a working bootloader/kernel on the internal partiton. If that's your case you can follow @davidfor suggestion: flash your backup to an external sdcard and try to boot from it.
Some things won't work at all in this config (ie: the "user" partition is hardcoded at mmcblk0p3 in the firmware) but you'll see -at least- the bootlogo and you can tweak the 1st partition of your external sdcard to get a working FW.
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