Using SD-WAN routing for traffic coming in on the SSL VPN

SD-WAN does not use Interface, it uses gateways. There are pre defined gateways like WAN Gateways (WAN Interfaces). You can specify your own Gateway with a IP Address.

PS: If you want to solve something in remote access with SD-WAN, i assume your are looking at the wrong feature? Maybe you need to be more clear, what you want to try to archive. 

When you create an SD-WAN you need to specify an interface that it applies to. I want to apply an SD-WAN policy to SSL VPN Users to direct port 4351 to a specific WAN gateway!  :)

Do a simple Trick. Do not select anything in Interfaces as Source. There is no VPN Interface. Only a virtual VPN Zone. 

Create a IP Network for your IPs within SSLVPN and use this as Source. 

Perfect, I thought the source interface was a mandatory selection!

Perfect, I thought the source interface was a mandatory selection!