If people are using outdated browsers, redirect them to a page explaining why you must insist that they upgrade, and explain how
It's not technically possible to do that without providing ciphers that the out of date browsers support, unfortunately. The TLS session must be established before you can carry out any redirection.
Yes you could do this for a while, before turning the ciphers off, and this is often what is done in practice.
Biting the hand that feeds IT
