I do get where they’re coming from with Lua. With luci (the web interface), Lua must be installed as it’s a requirement. However, it might be the stripped down version as well (AFAIK). Also, if you know bash & coreutils already, it might be counterproductive to have to learn something new.
I’m just glad that I could help. It’s not fun to get stuck in such technical roadblock.
This kind of thinking is the bane of humanity.