Unfortunately not.
Because the SSL traffic is encrypted you are limited to one SSL Cert per IP address the web server is listening to on port 443. Therefore the SSL Cert that is served up on port 443 must contain within it all the names needed.
Applying a new cert to the exchange server is a really quick process. Now that you have done it once it should be easy the second time. Or was the "Hell and back" getting approval to buy it?
godaddy sell UCC Certificates very cheaply