It’s possible to transplants if done gently and with plenty of care the roots are what you must be gentle with id move them to a 10ltr. Why keep them in a 3 ltr
Just watch them carefully, there is a small range between ample water and drought, they do not wilt, are green and healthy, but are not getting enough over all water/nutrients to put on heavy weight across mid to late flower. Midget plants is the best way to put it.
I would say loli pop to lower water demand, but I don't know how wide of a canopy you are filling.. so lollipop might actually reduce yield given your W amount and a potential unfilled canopy?.