@nil @moira I see where you're coming from but basically you'd end up hooking up a second QEMU instance with some rather limited and peculiar hardware. The SunPCi II board for instance is just this https://en.wikipedia.org/wiki/SiS_630/730 on a PCI card with some tricks that allow rerouting the display in a window and using disk images stored on the Solaris filesystem.

You'd be dealing with emulating the SiS 630/730 and even if you do that, you then already have a superior independent stand-alone emulator :)