I have a couple older machines I was gifted or bought at GW or yard sales to use for things like this. They are very basic but in good working order. My good machines don't leave my sewing room. Even my kids, that know what they are doing have to ask before they use them. doesn't happen often, but they all do love my Juki for certain things.
May not be practical for many but since I work with 4-H kids it works for me. Our clinics were successful enough we were able to buy several identical basic machines so none of us has to bring our home machines.