Rebarreling a Savage is the easy part. Take a look online for the steps to do it, not hard. I haven't read up on if the bolt face would need changed. They are slightly different between the two cartridges.
Another option would be the H&R that is for sale in the classifieds on here. Just a thought.
Remember, shoot straight and shoot often.
Good... Bad... I'm the guy with the gun.
I think the .223 is only very slightly larger in rim diameter. Getting the magazine to function would likely be a bigger issue but I haven't done or looked into any of it. It was just a thought. The swapping of barrels on Savages is really simple, though.