I would try the method described by George (plant small fingerlings) into X with as much forage as possible. I would want a bloom going as the yoy LMB put in (depending on size) will eat plankton/inverts at first then switch to a piscivorous diet (fish).
If I were going to try the plant adults to spawn route I would want them in the pond for 6 weeks prior to the spawn. This is because the stress of catching/ moving could delay or abort the spawn. Another option would be to move yoy LMB fry from the big pond to X. This is also hard as morts may be high and survival uncertain (you may put in 100 and all but 5 die or all 100 could live and overrun the forage).
The other plus to planting known yoy is you maintain the known quality for next time if you hold a few back. The negative is finding the right genetics for those planted yoy (sourcing is hard and uncertain).
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