If I understand correctly, you're using the existing Custom Spell thing with the tag from Combine Extracts to allow picking a second spell for the container? Unfortunately, you don't have access to the UI elements necessary to add a 3rd and 4th selector.
The only thing I can think of here is creating a new Custom Spell, which references your own custom built form. Might need to make a new tab and table to add it on as well. That's going to involve messing around with the raw XML and authoring kit stuff, which I am not sure how comfortable you are with.
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