I understand that VirtualBox has a "software emulation" mode (on x86 host and guest) where it doesn't use any hardware virtualization features, and instead runs

I understand that VirtualBox has a "software emulation" mode (on x86 host and guest) where it doesn't use any hardware virtualization features, and instead runs the guest OS with some sort of JIT that rewrites any hardware access to VM calls. Maybe that would work in Rosetta?