TLOC extension is the Cisco SD-WAN mechanism that allows a WAN Edge router without direct access to a transport to reach that transport through another WAN Edge router at the same site. Cisco describes TLOC extension as a redundancy feature in SD-WAN networks. In the question, the WAN Edge router is connected to an MPLS transport link, but Internet access is available through another WAN Edge device. With TLOC extension, the MPLS-only edge can extend traffic through the peer router toward the Internet transport, allowing the site to use multiple transports without requiring every edge router to have a physical connection to every circuit. OMP can advertise routes and TLOCs, but OMP alone does not create physical Internet access for a router attached only to MPLS. Requiring a local 4G/5G or Internet circuit on the same router is not necessary when TLOC extension is part of the design. An MPLS extranet is also not the normal SD-WAN solution for Internet transport reachability. Therefore, TLOC extension is the correct design method.