Since beans start so easily outside I don't really see a need to transfer. As most experts advice to direct sow. You'll be hard pressed to find any experts that say otherwise. I guess you can get a slight head start, but beans grow fast and will only really take off once outside temps and soil temps are right. So it would gain you little, and appears to be risky. Some advice I have heard is to plant over a period of weeks to give a more staggered crop. This I don't get? As they seem to keep growing till frost anyway. Maybe bush beans? I have never grown them, only pole.
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