I think I figured it out!

That sounds like a perfect problem for a programming language to solve. Not some newfangled fresh language where you need to solve a lot of problems and people need to learn new semantics, tooling, and libraries of course! No, it should be lua or javascript (or is that typescript or ecmascript), hmmm. Oh, I've got it! Use GralVM. Then you can aot compile all the code that can run on a jvm. Oh, plus it's designed to be a polyglot compiler so you should be able to mix and match languages you're using with it's help. Maybe even one language per module. Oh, and you've got that Truffle Language Implementation Framework with some more polyglot programing. Now you have a much better solution than making your own language. You can use everybody else's well tested and supported programming languages. Well, you end up learning half a dozen or so unfamiliar syntax but that is clearly better then figuring out something simpler in a single language that can easily solve the problem for a relatively unimportant and untested fallback for slower systems. Sorry. I just wanted to ramble some on lwn and this page has so many comments that my comment is guaranteed to get lost in the noise. I hope you have a nice day.