Is it likely to be at all worth the trouble of stripping, blasting, and de-brazing an old bike to have the benefit of (maybe) saving some bucks on frame components
Bending tubes and bending the lugs for a different angle joint
is usually done before they are assembled into a frame .. sounds like a lot of work for the results .
but it's your time.. & $
Or would it be more likely to end up as an expensive and frustrating exercise just to save some old frames from being melted down?
I'd guess This may be your outcome. YMMV