Routing specific DSCP tagged packets

Hi

My situation is like this:

I have 3 WAN connections and a remote site with a single WAN connection.

I'd like to monitor the latency to the remote site using all 3 WAN links and from a single address (our Opsview server).

I know I can tag the outgoing packets using DSCP. 

My question is now, can I use 3 different tags in order to tell the Fortigate unit to route each through a different WAN connection?

Thanks

Gil