Could this work? It could potentially help a very large number of people get out of these scams. Seems so obvious now that you point it out I imagine someone must've thought of this before.
I imagine the timeshare company has right of first refusal for transfers, or will be adding that to their contracts as soon as this is a thing.
Now, is it legal? Maybe, maybe not. But they will pretend it is until you take them to court, and they'll quickly settle if you agree not to tell anyone else.
A right of first refusal just means that they have the opportunity to buy the timeshare before you can sell it to anyone else. That would be a-ok for the customer, since either way the timeshare's off their hands.
Now, is it legal? Maybe, maybe not. But they will pretend it is until you take them to court, and they'll quickly settle if you agree not to tell anyone else.