Your portioned machines should hold up quite well depending on what hardware drivers you built your machine templates with. VMware ESX presents fairly generic hardware to guests. Just about the only thing that is different per host server that gets presented to a guest is the processor. The host's actual processor type is presented to the guest.
It is my guess that you should not have any major problems and this venture should work out for you.
As for boot managers, I cannot say that I have any personal experience running them inside of a virtual machine but I cannot see why they would not work. They tend to either write to the Master Book Record (MBR) or to the hard drive, both which are available in a virtual machine, otherwise guest operating systems would not work. :)
Hope this helps!
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