The Include/Exclude extension works on the meta boxes, not on fields. You can hide/show meta boxes in a settings page using callback function without any problem. However, if you want to show/hide a field, you might need to do a trick: separate the original meta box into 2 meta boxes: 1 for all other fields that always show, 1 for the specific field that can be shown/hide in the settings page. Then use the Include/Exclude extension on the 2nd meta box.
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