Vlan on Red Interface

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[amdan]

I have a ASA5520 as a edge firewall/VPN gateway. I need to setup site-to-site VPN and remote access VPN for road users. Im going to use Endian FW as a second layer of defense. Below is the how network is setup.


INTERNET <------>ASA5520 <------->Endian FW <-------> Internal LAN

In my Endian FW i need two WAN link..one is for Site-to-Site VPN(10.10.10.1/24) and other is for remote access VPN(192.168.154.0/24). Can i do this with VLAN on red interface?
also NAT  is used for Site-to-Site VPN on Endian FW. But i dont want to do NAT on remote access VPN users as they will be only our staff. Is this setup possible? If so please let me know how to do this.