Hi
i do not use the mentioned 3rd script to include micropython and lua
so if you want know the steps to include micropython and lua when using the 3rd script is the best way
to ask the creator of the script.
If you want try byself, one possibility, however, would be to adapt the script so that it integrates specific user desired configurations during execution. Many possibilities with scripts - a lot of gimmicks possible - Take a closer look at the script and follow the process and how the individual configurations are made and setup the script to your user case and possibilities you want goes into.
If you want going comfortable way, you can use the buildroot.
it's an amazing tool for the kernel und root file system basicly, and used also adapted for this port.
An other possible way like i did/do is to cross compile with the toolchain and build all from scratch example micropython example Lua.
I am away for now from the s3linux software portings for a while of summbreak and changed to the hardware side for practice testing things and new s3linux software porting things in autumn for now.
JLYK: I am slowly to response - we have a long summerbreak here and back earliest 25. Sept regular. Not allways online in this.
best wishes
rudi