I feel something isn't right with your description. First without a switch in front of your FGT (I'm assuming you're talking about arrangement around a FGT), you can't terminate two physical ISP circuits on one device.
Then, with FGT's VLANs, they're not independent L2 interfaces unlike L3 switches. Each VLAN is bound to an L3 interface. So you can't have multiple L3 interfaces on a VLAN.
Or are you NOT talking about FGT at all?
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