Can you run this in another sandbox? Not sure why you'd want to... but can you?
Nested page tables / nested virtualization made it to consumer CPUs about a decade ago, so yes :)
It's pretty common to run VMs within containers so an attacker has to escape twice. You can probably disable 99% of system calls.
Nested page tables / nested virtualization made it to consumer CPUs about a decade ago, so yes :)