Override the template used by attribute_[edit|view]_gui (enable DebugOutput and ShowTemplates in site.ini to get the clues you need.) and make your custom template look for custom attribute_onchange variable if you need to define this in edit template.
Thanks for the tip. I thought there might be a way to pass the needed fields into the existing operator, but making my own with the required values sounds good as well.
Thanks
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