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Flip it. Run the games on bare metal with nothing on it but games and a VM. use the VM for your personal system.

That achieves nothing. A hypervisor can see and manipulate any VM it runs. By extension, a compromised kernel can do the same.

How about with homomorphic encryption?

I’m not aware of any OS that supports it for this use case.

On Android this isn't true with support for protected virtual machines.