It really depends on when you plan to travel.
If you're looking for high demand summer weeks, you might be better off renting your Maui week and using cash to rent.
Unlike Hawaii with year round demand, some destinations have very low demand weeks.
As stated above, take a look at II's cash rental getaway rates if you're willing to travel off season (November through March) in Marriott's locations in Spain, France and South Carolina.
April and May is also doable via II trade for Spain, South Carolina and Newport Beach maybe using you Kierland week if you're flexible with your travel plans.
Abound is another option but take a close look at their point charts (attached) and visit their website to get an idea of availability at various points during the year. Again, if you can travel outside high demand times, you can book several lower season stays (based on availability) using a single Maui week deposit. The following tips are from the FAQs (
link).
NOTE: Also make sure you understand the banking/borrowing rules before you make a deposit.