Good tip on Enum.ITEM.value, that one caught me out for sure! And thanks for the notes on property definitions/annotations.
I guess my question was more about how do I pass an argument from Blender, as opposed to in code. The linked answer Blender_fun1 mentioned show’s how to do it both from code and in a panel layout; but I’d like to avoid the panel approach if possible! My goal is to speed up working with text sequences, so a keyboard-only approach would be great.