So, just wanted to contribute back to this thread with info that might help (and offer a chance for someone to correct me!).
A few years back I had virtualized unRAID via PLOP and could first-hand attest to the slooooowww boot time and issues with that; so much so that I had gone baremetal. With a new build, I decided I'd revisit virtualizing unRAID under ESX, and ran across plopkexec (actually mentioned elsewhere on this forum for a different purpose). I can say that this drastically cuts down on the boot time (for all perceived purposes, same as bare metal). With passed through M1015, I now have effectively the same config as my prior bare metal (and even moved it over seamlessly) without the hassles I recall of the AIO solutions prior.
Granted, this is now a day in, so still waiting for the other shoe to drop...