Kinda like mainlining/manifolding???
No that's too much effort and veg time, especially for autos imo. Just LST. Like this:

The top will keep trying to grow upwards after you tie it down, so you need to keep tightening the tie so the side branches are higher. They should bush out like this:

In that space I'd just let them grow naturally. LST above was to fill out the 2x4 after culling the weaker plants.
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