How can I disable the internal Lua support entirely?

I find the built-in Lua 5.4.7 interpreter keeps getting in my way in multiple respects. I've un-ticked the box for Lua scripting support in the "OPTION" dialog already, but every invocation of a 'lua' command is triggering the built-in support by default rather than invoking my external Lua 5.1 installation as I need. Is there some way to disable the internal Lua support entirely? Thanks in advance!