Total waste, total overkill. Don’t bother.
You can’t make the video better then the original.
A good practice when using dv25 footage is to edit in dv25 and when the edit is locked, change sequence settings to dv50 and re-render. This will give you the added color space and much better compression for stills/grfx/effects/moves/etc.
Or just start edit in dv50 timeline too.
Anything above that for the basic edit you mentioned is wasted time/space/energy.
Chris Tompkins
Video Atlanta