I was given two clones today in solo cups with soil. They were originally clones and have a rock wool base that is in soil.
It is pretty easy to move the clones to a hydroponic system depending on how many weeks the clones are and the root infrastructure. You basically clean the dirt from the rock wool and roots then slowly place the plant along with the rock wool I to the hydro system.
The plant will usually go through a small shock but will stableize after 1 or 2 light cycles.