changing region code of nero image

the only thing i can think of is burning the nero image to a cd then reripping in bin/cue format to satconv it... is there any other way without having to use a cd?
You can use CDMage to make a cue/bin out of the nrg, but I don't think any of the region-changers work directly on Nero images. I suppose you could modify the area code by hand using CDMage's sector editor if you're feeling tricky.
SatHeader will work with nero images directly, otherwise you'll have to convert it or hex edit the image manually.