If you can't buff it out, as a short-term fix I'd try Dr. Color Chip. It has some good reviews on this site and others.
http://www.drcolorchip.com
The darker the color paint the better it seems to work.
Like you, I wouldn't try standard touch-up. It's potentially too sloppy unless you really know what you're doing. Some guys on this Forum are pretty darn good at it. Dr. Color Chip essentially limits the paint to the confines of the scratch. It might not make it 100% better -- but it certainly won't look worse. I did a fairly deep key scratch on wife's Dark Blue Mercedes a few months ago and she couldn't see it from 4-5 feet away after I was finished.