using fortigate and fortiswitch for wan backup

Hello,

i have two locations connected via ethernet. on my fortigate in the first location (hq) i've configured a wan port to the second location. on my second location there is no fortigate, only a switch.

now i want to configure a forti secure access switch on the second location and use fortilink to the fortigate on my first location.we got a second connections (wifi) from the hq to the second location.

i want to use ospf on my fortigate on the HQ and the fortiswitch on the second location.

ospf is for redundancy my connection, if the primary connection fails.

is that possible?