Mirror WAN Port on FG-201F

Hi Experts,

I need to mirror my WAN traffic. I have two FG-201F v.7.2.5 in an active-passice cluster here.

WAN1 is in use as a Physical interface right now, handling our WAN Traffic.
Is it possible to create the SPAN configuration without causing a downtime?

And, can I have a VLAN Switch (I read this is the new name for a hardware switch?) as my WAN interface then?
I fear I'll need to change a lot of configuration (routes, ipsec, firewall rules) if I change the WAN interface to a switch.

Thanks for your input! :)