>This is mostly because their approach to SIMD is so different, but also because I can't test it at all. Are there any RISC-V "machines"? that one can use to do something useful or fun with that someone here could recommend?
I would also be interested in RISC-V emulators etc.
QEMU. Docker, using QEMU under the hood, there automatically with Docker Desktop on Mac & Windows, install QEMU yourself on Linux and configure binfmt_misc to use it.
I would also be interested in RISC-V emulators etc.