Ethernet br with ipv6 to ipv4 module

Hello everyone, I want to implement the gnrc br example for a battery powered device(openmote cc2538),without the existence of a computer , with Ethernet support. Is it possible something like this or the br example requires to initialize the br by using the in the tools/ethos directory? Also, is there on riot os a ip64 module and if not is it possible to use the ip64 module of contiki? Thank you in advance!

Best regards, Ilias