I followed the instructions for luci-ssl + uhttpd as per this page: LuCI Essentials (OpenWrt Wiki), inclduing starting the uhttpd service.
Now I can access the standard OpenWRT Luci admin web interface via SSL at 192.168.8.1. 192.168.8.1 on HTTP still resolves to the GL-iNet admin web interface, which I want to access via https as well.
Can anyone please tell me how to set things up so that the GL-AR750 works the same as per factory settings, but with https everywhere? (I’m happy to use the GL-iNet “Advanced” link to get to the regular LuCI web admin interface.