It is correct that the MR-JE-C supports MB TCP.
Maybe the MR-J4-GF-RJ can be an option. It supports CC-Link IE Field and CC-Link IE Field Basic.
If you set up this servo in CC-Link IE Field Basic mode it can be controlled by a standard 100mb Ethernet port. It supports the CiA 402 drive profile (mostly).
But it depends on what kind of functionality you need.
Take a look in the linked manual to get a better understanding of the setup and protocol.