https://marco.org/2009/01/30/danielpunkass-ideally-twitter-would-offer-its
Ideally, Twitter would offer its own URL shortening service. Then the shortened URL has the same life-span as the point-of-use.
This seems a bit like asking for a faster horse. A better solution might be to associate a URL with a post directly, as metadata, without requiring it to be part of the 140 characters.