Quick question...

I have looked at several posts about this and after reading them, I know it's not easy to do in Nintex. I have a workflow that calculates due date. I created a list called Holidays and want to run a lookup in my workflow to say "if the due date is equal to any of the dates on the Holiday list, update due date to a specific date or add a specific number of days (which would be the next work day). If not, just add 1 day to the due date (for my daily frequency listed below). Sounds like a good idea to me. Is the set a condition action good to use for something like this? Would it even work? It would be inside a switch like below. Just not sure how. Cassy Freeman​