I've gone back and forth over exactly how to do this. My original thought was either a template or the current list of columns. But, allowing both is probably the most compatible. Which is the way you are doing it. But, I'm not a fan of adding what is effectively a special column name. I would normally add a checkbox to enable the feature and that would be enough.
Can I get a copy of your code? That should save me some time, at least for a quick test to make sure I have understood what you are doing.
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