I don't think that's insanely hard. If you squint hard enough, WASM has those 3 things as a goal, and it is conceptually much easier than developing a regular,

I don't think that's insanely hard. If you squint hard enough, WASM has those 3 things as a goal, and it is conceptually much easier than developing a regular, general purpose language, say Rust. If you want to focus on performance as well (as WASM does), well, then it becomes really challenging to find a middle ground that works on IA64 and a 6502 chip. So I guess what I am looking for is WASM with less focus on performance and more on portability. Forth might be half a layer above the CPU, but is insanely portable and/or simple to implement from scratch, which is why I mentioned it.