Assuming you’re looking at primary extraction, I’d use an edible oil rather than PG. VG does a terrible job solubilizing cannabinoids.
And: Low dose CBD DIY
The key to efficiency here is getting all the extraction solvent out of the biomass.
Who wants to tell the class the trick that gives “oil” the edge over PG extraction here?!?
If you’re looking for a syrup, there is plenty of exploration on formulation to be found here.
PG is probably not a horrible place to start.