Out of curiosity, what is the use case? RISC-V is new enough that it is unlikely to be needed for 'dusty-deck' (source code long lost) that was needed for the VAX --> Alpha binary translators, or for Univac (ones complement!) to X86_64. Why require a JIT? For static binary translators (based upon experience) the biggest difficulty is a combination of variable-length instruction decode and/or self-modifying code (requires an interpreter) and/or re-entrant-into-the-middle-of-an-instruction (easiest to handle with an interpreter).