You could probably find a small ish hand file and handfile em out. good ole elbow grease should do the trick. If you have a dremel tool that could work well too. As far as your chainline, you can probably get close by putting the chainring on the other side of the cranks you would normally and or using some washers to space it a bit more, or you could measure it with your current bottom bracket, figure out the difference and drop 30 bucks into a bottom bracket that fits the chain line. I think your chainline will probably run 45mm i think, unless you run the freewheel side, in which case it might be different.