I became a member by buying a small resale contract in February for VWL with the plan of adding on at BLT.
When I added on last month, I realized I really just wanted BLT so I asked my guide if Disney ever made 'swaps" so that I could sell them back VWL and rebuy at BLT. They said that does not happen.
I ended up putting it for sale myself through a broker and we are in ROFR now. It would certainly be ironic if Disney exercised that and ended up with it anyway!
Good luck