Hi,
TMOS supports both certificates with
subject alternative names
(aka SAN certificates). So just request a new cert containing not only the common name in the subject but also the common name and additional names in the subject alternative names extension.
In addition the new TMOS version suport
server name indication
(aka SNI). Its an extension to TLS which is putting the expected CN into the clients SSL hello message.
This information will be used to pick the right client-ssl profile.
Just use multiple client-ssl profiles in context of your virtual server definition supporting the different hostnames you expect.
Thanks, Stephan