Great that you have been so successful with your worm composting setup.
Here are my thoughts: You could spread out a small tarp, then scoop out small amounts, about 2 cups at a time, of your worm castings. With gloved hands spread out the small pile, remove the worms and set them aside for “re-use”. This is a bit of a tedious process, which may done over many days / when you have the time. You will be rewarded with a fine soil amendment.
After that, If you wish to screen the castings then you would have to expose them to air for a few days. Once dry, they will easily pass thru a 1/4 “ hardware cloth screen, available at most hardware stores. I would not recommend using window screen as the holes are too small and will plug up quite easily.
Hope that this helpful. Get back if you have further questions.
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