Wasn't OpenVMS stuck in a similar situation in the late 1980s, where they had tons of VAX MACRO assembly files they had to transpile to Alpha, then Itanium and

Wasn't OpenVMS stuck in a similar situation in the late 1980s, where they had tons of VAX MACRO assembly files they had to transpile to Alpha, then Itanium and nowadays x86_64? VAX is a rather different beast than 32-bit ARM and that bandaid would result in a hybrid 32/64-bit operating system, but I wonder if a similar solution could be implemented for RISC OS.