In case somebody stumbles on this thread it may help to know I was able to remove some packages from Applications > Plug-ins, which freed up a little space. I won’t be using VPN on this router, so:
gl-tertf
gl-vpn
gl-vpn-server
gl-wg
gl-wg-server
kmod-wireguard
openvpn-openssl
wireguard-tools
Et voila:
