It looks like there's an fpga implementation as part of the mister project. It could scratch the itch if the real hardware is out of reach.
https://github.com/MiSTer-devel/Archie_MiSTer
You could get any Raspberry Pi (even a Zero) and run RISC-OS on it.
You could get any Raspberry Pi (even a Zero) and run RISC-OS on it.