I was working with moonsharp before.While I like it in general, but I had same issue with lua multithreading.
I gave up on that, and I wrote instead own parser, which is very close to javascript alike and I do call own custom functions, to “communicate” correctly with jobs.
I convert parsed code into int representation of instructions and values. Kind of like assembly approach.
This way I can even use it with burst.
You could also give a shot to miniscript
I don’t know, if it will suffice your requirements.