I think you are on the right track.
Growing smoke isn't hard, but learning to grow anything new is a learning curve and you are going to kill some plants along that curve. Might as well be bagseeds that are already paid for.
Especially since you are not set up yet for your 'real' grow.
I agree with HG, and wouldn't bother to grow them to flower. But for most, the problems are encountered before the plants reach flowering size/age.:hubba:
If you can consistently grow them to 5-8 sets of true leaves without killing them, time to spent the $$$.:holysheep:
Perhaps a new crop each week for a few weeks?
DD