I would just rent the two bedroom for the years you are not using it. I think the hassle factor of advertising two reservations (plus fees, if using Redweek), lock off fees etc would not be worth the minimal extra rent money you could get if you split the week. As others have said, GC does not generate very much in rental. A much better option would be to lock off and trade in Interval.
For a high demand week at another location, it can make sense to rent. As an example, sometimes I will lock off my 2 bedroom Mountainside ski week. If you look on Redweek, a suite or one bedroom will rent for much more than the MF. Renting allows me to use the 1 bedroom for free and I have little extra left over to cover dinners etc. Not all weeks are created equal. Renting vs trading comes down to MF costs and how much you can rent on the open market. I think the best place to get an idea is Redweek. Make sure you compare to listings that have rented...just because someone is renting for an exorbitant amount of money does not mean they will rent it. If you place your listing reasonably compared to what others are asking, you have a good chance that it will rent.