Not really possible because you might find a renter and by then the inventory is gone. You would be better to find a high demand week at your home resort, put that up for rent, and if it does not rent cancel it prior to the 31 cancellation period. Have a backup plan to rescue or bank points into HHonors or RCI if rental fails.
Find a holiday week or other high demand week.
OR place an add with a range of week, but that you have to check inventory. Frankly I find that this is too much work, as I get a lot of asks for impossible finds.
OR Do a hybrid, find a high demand week, and in the rental notice, state that other weeks MAY be available depending IF inventory is available. Rentals usually happen 1 to 4 months prior to checkin. I have rarely rented farther in advance, unless it is a very specific holiday week.