Looking for a method to swap two modifier keys (Option and Control) for just one App

In most of my programs, holding down Control and scrolling my mouse wheel results in the view zooming in/out for the item. But in one program (Skim) it is Option, not Control.
So I was looking for a way to swap Control and Option for one program. I am aware of the Mac System Setting "Keyboard" that lets me assign these but that is a universal setting.

Check this one - Low Level Key Remapping · GitBook

yup, this should work:

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Absolutely PERFECT!! Thank you!!