What happens if you plant them in the ground like that and provide enough fert for them to grow, they should grow normally should they not. Mind you it will make it difficult for removing suckers and bugs as well as priming.
I'm sorry. That is unlikely. You may get just as much leaf weight per square foot of garden, perhaps a bit more, but definitely not per plant. And you would be stringing many more small leaves to get that.
What you suggest -increasing nutrient density to essentially, three times normal- sounds logical ; however, there is still issue of root volume which will be way down. There is not a linear relationship. Three times the nutrients does not equal three times the uptake. The plant can and will only take up as much as it can, or needs at the time.
And what have you done to the salinity, osmotic pressure, and the microbiological environment of the soil by increasing the nutrients so dramatically?
Also, there is a direct relationship between root size and plant size. This isn't just because bigger roots can bring in more nutrients. It is also because much of a plants metabolism of carbohydrates occurs in the roots.
I still go with Smokin Harley's advice. Snip the biggest ones at the base.