That sounds interesting.
rcork can u do that w/ refit please?
good-samaritan-message is the greeting you can put in the login screen. e.g. mine says "$name | +phonenumber reward if found"
it needs to be in nvram so that the EFI boot environment can display it before filevault is unlocked.
VMware would fix the bug via a software update to their product rather than instruct on how to fix it inside the system, meaning you'd only get it working through VMs (as would be the only thing they care about). Meaning you'd have a lot of work on your hands regardless of their fix, if only to figure out how they fixed it in the first place.
That depends entirely on what method they use to resolve the issue. If they have to pass something from the host to the guest, yes, but if they have to expose the method used to generate the values for a Guest or via VMWare Tools, no.