What you’re trying to do sounds really interesting, and there are probably other users who may have a similar need, particularly if importing content with different URLs into EE.
However, basic URLs are not usually intended to be changed frequently, if at all, and for a bunch of reasons (search engines hate those changes, servers take on extra load to account for them, plus, the manual effort required to change and then add redirects in .htaccess.
EE makes it very easy to change the title of an entry without changing the URL (though changing that is easy enough, too), but there’s no automated way to create a redirect for an entry with a changed URL. It’s “just software” so it could be done, but seems like one of those efforts that promises diminished returns.
Why do you need to change URLs so frequently?