Separatory funnels can be a bit problematic when using an STB. You're going to want to use something like a turkey baster or a pipette to pull the solvent out, and then if there's any basified liquid, you can separate that out using the funnel.
With an STB, you definitely do *not* want to filter the liquids out, especially not only a few hours later. This goes again double if your bark isn't finely powdered. Using an STB, it takes
at least a week to get all the easily accessible goodies out. You're depending on the strong base to break down the cell walls, in contrast to the heating and acid when doing an A/B.
Freezing the bark can help when you're powdering it, but I agree with thesilence877 not to complicate the tek until you have the basics down.
PK Dick is to LSD as HP Lovecraft is to Mushrooms