Hi @camsaway,
you have sucess building the firmware? Looking your github (https://github.com/openwrt/openwrt/compare/main...camsaway:openwrt:main) the code is similar to the PR of Linksys SPNMX56 (https://github.com/openwrt/openwrt/pull/17968/files) and seens good. But RTL8367S maybe really have restrictions (Reduce number of drivers for RTL8367S - #2 by mietekn) to HSGMII.