APM - Network Access - PBR

Hello, I wonder if the following could work and how to configure it?

1: VS with Access profile and policy resulting in a network access webtop. 2: Some kind of iRule/Policy Based Routing to route the PPP clients out on a specific VLAN interface with a specific default gw set?

All examples/documentation I can find are related to forwarding VS and not VPN. Could it be that I must leverage route domains perhaps? Should that then be selected in the access policy? or how to set it up correctly?

BR, Henrik