You could change the .config file used when building pesa1234´s MT6000 custom build. It supports WED Offloading (wireless ethernet dispatch), not sure it´s enabled by default.
Clone the repo, and ensure the .config file includes this:
CONFIG_TARGET_mediatek_filogic_DEVICE_zyxel_ex5601-t0-ubootmod=y
CONFIG_TARGET_mediatek_filogic=y
CONFIG_TARGET_mediatek_mt7986=y
CONFIG_TARGET_mediatek=y
.. and then build it.
EDIT: Whoops, missed that @frollic already mentioned WED