Destination based routing

Hi. I've created a standard VIP 0.0.0.0/0 (for TCP) using a pool whose member is the IP address of a router. Basically this is to forward traffic through the F5 to a gateway - I'm using VLAN groups here, but this method restricts me to TCP & UDP traffic only.

 

Ideally I'd like to use a forward all VIP & FastL4 but this doesn't allow the use of pools, is it possible to use an iRule here? So in a nutshell what I'm trying to do is pass traffic through the BIGIP to a gateway on the other side. Thanks, Dave