I then would finish the task as is and before trying to start the VM the first time I would check drive-letter assignment with a BartPE disk.
Then I would create a snapshot and test. if the driveletters really come up reversed you can edit that with a BartPE.
You would have to edit the key HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
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description of vmx-parameters:
VMware-liveCD: