I would assume that you've looked at the requirements. It states "Use the VISA I/O library to communicate over the GPIB, VXIbus, Serial, USB, PXI, and TCP/IP bus interfaces." and this is required.
Imho, one of the huge advantages of LabVIEW drivers is that the source code is available. You can modify the driver or fix bugs (and there will be bugs). Placing a wrapper around a dll defeats all of that and should be avoided. You are of course, free to create a driver with any method you like but personally, I would not define a wrapper type driver as LabVIEW Plug and Play.
