Hi friend.
For question 1:
No configuration is available to balance outgoing traffic from the OLT to the MPLS network and carrier network (UFINET).
For question 2:
Yes. You could use the policy-based-route command.
The policy-based-route command is used to create a policy-based routing (PBR) and enter policy-based-route mode.
The undo policy-based-route command is used to delete the created PBR.
By default, no PBR is created.
Usage Guidelines
A PBR matches the packets of a specified inbound interface based on the configured ACL and forwards the matched packets to the next-hop configured on the PBR.
When a PBR has applied to the Layer 3 interfaces, the configured parameters of the PBR must not be modified, and the PBR must not be deleted.
For more details, please click: policy-based-route
I hope I can help you.