Kristof,
in order to be able to perform a http redirection you need to SSL-terminate the connection on the ACE. The point is that unless the ace terminates the SSL connection it will not have access to the underlying encrypted HTTP session, so it will not be able to see the http request and it will not be able to issue an http redirect.
When a client connects to an https service just after the TCP handshake it would start the SSL handshake and until the ssl handshake is successfully completed there is no possibility to send any http redirect.
So if you wish to redirect you need to implement ssl termination on the ACE.
Hope it helps,
Francesco