Are you plagued by that need for five 9's and have an Oracle RAC VM?
Can't spare the time to shut down that VM?
You don't need the Bass-o-matic 76 just the following to allow you to alter Change Block Tracking with an online VM. (Though a Bass-o-matic is highly recommended).
Just fetch your friendly PowerCLI interface to VMWare and connect to your friendly neighborhood vCenter:
$vmtest = Get-vm $vm| get-view
$vmConfigSpec = New-Object VMware.Vim.VirtualMachineConfigSpec