The new Nv2 (TDMA) Sxt 5HnD CPE by Mikrotik can suprise with the speed, configurability and scalability. Even though it has only Level3 of Mikrotik License it is enough to make PtP bridge. This is an example shows how the bridge be done using MPLS instead of WDS.
WIZ110SR Plug & Play Type Serial to Ethernet Gateway Module Serial DB-9 Connector
Features of Wiz1100SR:
All-made serial to Ethernet module
Simple and quick network implementation
Available of firmware customization ...