If i understand your question correctly, you want two connections between two PAN's? I have done this many times in the past and works out pretty well. What I usually do is setup a Policy Based Forwarding policy that sends all traffic over the MPLS connection on the far side 'stub' network. I also have OSPF setup between the two so that routes are updated automatically with the VPN connection with a higher cost so its not favored unless its last resort.
This way id the MPLs goes down, it'll swap to the VPN and when the MPLS comes back up, it fails back to it. I usually build in a minor delay to prevent flapping incase the MPLS is bouncing.
Let me know if you need a deeper dive.
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