Can't this be done without a warrior rush? A lot of people seem to have trouble with it. I rolled like six starts last night, doing the exact same thing you said, and I just can't pull it off. Isn't it much faster to build a warrior until size two, then start a settler, and steal workers from a militaristic or hostile CS? A settler is 89 hammers, a bit more than two warriors (40 hammers each) that you'll lose anyway with a rush (IF you can pull it off). Further, an early attack will cause some DOW's later on, which is another drawback.
You often won't have the early techs to get luxuries from a settled city so you usually want to get them through a peace treaty, going for no warrior rush early usually hurts you a lot.