Chances are you can't get your resort to change exchange companies. I'd LOVE to get one of mine to change from RCI to I.I. but, I would need to convince the HOA and management company that would be in the best interest of all owners. Something not likely to happen. Owners would also need to wait until the contract with the current exchange company expires.
In my case, I have hope. My resort's management contract was taken over by a new management company when the previous management company/developer went bankrupt. I've seen a rift develop with the new company and RCI as RCI downgraded the resort from Gold Crown to Silver Crown. This after the resort had been Gold Crown since inception and, more importantly, after the new management company and HOA jumped through hoops set by RCI (and invested a lot of money) to maintain Gold Crown status (according to employee's, not sales staff, but still maybe not the best source).
In short, I think you're stuck with I.I.