There is a much simpler way. Just root the NC and install CoolReader 3 or FBreader on it from the Market. CoolReader was developed in Russia and does an excellent job with the FB2 format. I read mostly FB2 on my my CM7 Nook Color using the CoolReader app
Actually one of the first things I did when I had my hands on the NC was to build an sd card with CM7 on it and then, when the device booted from it, I added several Cyrillic readers - fbReader, Moon+ and (I think) Aldiko. All worked well, but I found the rooted device to be somewhat buggy and, because of all of the running processes, somewhat slow. I had to keep going to the AppKiller to kill all of the background processes. In addition the icons were so small that I thought it was not practical for my wife who has rather poor eyesight. Hence I returned to the basic Nook Color.