How to map live site to separate website without reverse proxy?

Good day,

I have Lenya running on Tomcat.
I have found information on website and in this forums on how to map live
part of specific publication to, e.g. "www.example.com"
while having authoring environment at "cms.example.com" - using reverse
proxy (Apache) + mod_rewrite.

I have request from my customer to implement same schema without reverse
proxy... :-(

I'm not sure this is doable by means of Tomcat configuration but if anyone
can suggest me some solution,
I would greatly appreciate your help!

I know Tomcat has notion of virtual hosts like Apache do - can this be used
somehow?

--
Igor