Hi,
VRF is the only way to create different routing contexts on one router. In your case we talk about VRF-Lite because the router is not a true PE (no MPLS, no MP-BGP,..)
Also I don't see the advantage of having a LAN and a WAN VRF if you need inter-vrf communication. It will just add complexity to your design.
May be if you elaborate about your requirement, we could help you to find the right solution.
Regards,
Laurent.