In the past, I've had great success, in my humble opinion, with coaching new students to first reach the point where they can reliably handle 300 two-handed swings in 15 minutes or less and feel fully recovered for the next day's training session (16k for ladies, who make up most of my students, and 24k for gents--this can keep them busy for at least a few weeks) before advancing to the one armed version. When this benchmark of the daily 300 is met, I challenge them, if they're game, to the "10,000 Swing Challenge" popularized by Coach Dan John. I'm always on hand to keep time, monitor their heart rate, and to make sure every swing is hardstyle. Typically around this time, both ladies and gents tend to be closing in on the "Simple" TGU goal, as well. For full disclosure, these are also military people I deal with, so the mileage with other segments of the population may vary.
After successful completion of the 28 day 10k challenge, I'd start having them mix it up with one-armers, and from there; once they've demonstrated power in the technique (and they've met the "Simple" TGU goal), we progress to cleans, presses and snatches. Time for the RoP.