A few more quick notes and fixes to what I posted (I just tried it out myself on a local box):
ProxyRequests Off #is the correct syntax with the space between Requests and off
ProxyPreserveHost On #I left off the On directive in the first post.
Order deny,allow # there is no space after the comma between deny and allow deny,allow is correct.
You can find reference information for mod_proxy here: http://httpd.apache.org/docs/2.0/mod/mod_proxy.html
bind and some other options out there would work as well. This is just the way I'd solve the problem.