That approach is more of a straight-to-hard approach. An easier method would be to retain one browser (Safari), and import your old bookmarks into the new Safari under a specifically titled folder to separate them, and sort/delete them at your leisure.
If you would like to make it more difficult on yourself and you don't care for FireFox, Chrome, etc. I would suggest using Webkit, since that's the underlying guts of Safari, and the experience will be the most streamlined for you.