T1 Point to Point

I have a point to point T1 line from one location to another. They both have a cisco router on each end. I was asked to install a firewall on a dsl connection so they can create a VPN and get out to the internet because there is no internet connection on the point to point T1 line. The main office has the internet connection but the remote office does not. All 3 Windows servers gateway point to the point to point T1 router instead of the dsl connection. How can I get at least one server on the dsl gateway without messing up the point to point connection?  I need to point the servers towards the dsl connection which has a sonicwall on the dsl. The client does not want to spend any money on anything except for tech time to get it working with what they have. The remote office does not have any access to the internet.