I have VPN access to several machines in my office from my home machine. I'd like to be able to access those machines from another computer on my LAN, without setuping a second VPN access. Both computers are Windows 7 machines.

Is there a way for my "main" computer to share its VPN access to another machine on the LAN? 
How would one setup this share?

I don't think "simple" Internet connection sharing fits my needs because: 

1. My LAN already has its own DHCP/Router to access the Internet, and I'd like to keep it this way
2. I can't access the Internet through my VPN connection