First - avoid setting static routes on a workstation, especially if we are talking more than one workstation.
VPN connection details? routers or firewalls or hybrid? What kind? Route based VPN or policy based?
With a hybrid you can setup rules that would say http traffic outbound gets tunneled through the VPN connection. Then the US office side would then NAT the traffic out its internet interface, get the response, and then tunnel it back.
Or a simpler approach on the same lines would be to set the default route to go across the VPN connection to the US, and then all traffic would be "dealt with" at the US side regardless of type of traffic.
We've done this with locations that only had an MPLS link back to HQ. We would route internet traffic for them.