There are two parts to transferring a timeshare deed.
Changing the legal ownership is easy, you can add or subtract names from the deed, or record a sale or quitclaim deed to another party. Presto, the legal ownership has changed. MVC/Vistana doesn't have to approve and probably doesn't even know about it.
But the second part is getting the developer (MVC/Vistana) on board with the changes you have made. Just because you've changed the legal ownership, doesn't give the new owners any rights to use the Vistana reservations system or other tools. And I suspect that transferring legal ownership without notifying the developer probably violates the terms of the deed restrictions you are legally on the hook to comply with. So your clever workaround is not going to get you anywhere when you actually try to use the ownership. Vistana/MVC is not going to recognize the usage rights of the new owners, and I'm certain they would look at this as a resale.
But I don't know what they'd do if the sale/transfer had already occurred. I suppose they could sue the seller for violating the contract/deed terms and not giving them ROFR, or charge the new owner a hefty fee to be able to use what they own, or... I don't know what other remedies they might have. But I'm sure that people have tried to pull this and my expectation is that it doesn't end well. I'd love to hear from someone who had done this.