Can you put a 17 caliber barrel in a 25 rf frame and make it work so you can have a shootable gun again?

With enough money, almost anything can be converted into almost anything else. I'm sure you won't find a "ready-made" .17 barrel, but a good full-service gunsmith could make one or modify one to fit your frame. There would probably be additional modifications required to the firing pin and extractor. It would be much cheaper to get another gun to use and hang your old Stevens over the fireplace. RELINING The barrel can probably be relined to one of the .17 rimfire cartridges. This process involves drilling out the entire bore, setting a liner in place, chambering and cutting the extractor relief. Would have to take measurements to see if the existing extractor and firing pin would work.