I'm curious what you're really referring to with Lua. (casual hobbyist here) Is that the UCI implementation stuff? I tried to use my intermediate Linux desktop user experience with bash in OpenWRT, but geez that is frustrating without all the bash extras I'm accustomed/detailed help/manual pages. That on top of trying to figure out NFTables is still a bit too much for my little brain to compress. I just started messing with UCI commands so I haven't looked under the hood on that one.
Any ideal device recommendations for fun chipsets to seek out and play with for embedded stuff in this space?