No it is not a practical thing to do and yes you would be most likely destroying a good frame. If it is a production instead of custom American frame it is probably brazed with brass which requires some special knowledge and skill to take apart successfully if the lugs are going to be used again.
That isn't to say it is an impossible task and if someone gave me an unlimited budget to make it happen I would most likely take off the whole front end and rebuilt that with 3 new tubes and head lugs. A rule of taking a frame apart is that you can't at the same time undo 2 places that have been brazed together. For example if you are removing a rear dropout you have to cut the dropout in several places so you undo the piece in the seat stay and then undo the part into the chain stay in 2 steps.
So to take your frame apart some tube has to have a section cut out in order to remove the other pieces. And then it is like trying to put Humpy Dumpy back to gather again. It is just easier to start with new pieces.