LuaJIT’s DynASM would go a long way there; might even have reusable stubs. Or slightly crazier, if 520K isn’t too big a burden: wrap the LuaJIT cffi ...from C.

LuaJIT’s DynASM would go a long way there; might even have reusable stubs. Or slightly crazier, if 520K isn’t too big a burden: wrap the LuaJIT cffi ...from C... and embed all of LuaJIT. (by the way: thank you for libffi!)