Potential Buy Back?
I am unsure what you mean by a potential buy back? Please explain. Do you want to offer the usage of your unit to someone say on a yearly basis, until your situation improves?
Here's an alternative to selling? Selling is a tough thing to do, because you get so little in exchange for what you have paid that you feel bad for a long time.
You can look into holding onto the property and reserve a prime summer week and rent it out on Tugg or craigslist and cover at least your maintenance fee. If it does not rent, than deposit it into RCI and you have 24 months or more to book a vacation and after all you usage period is EOY. So you manage to simply manage your vacation usage.
What I don't understand is how moving effects your usage. Where ever you move, I expect you still plan on a week's vacation, and through RCI there is a local drivable destination resort if you want to keep your vacation costs low, and if not, simply travel to a much nicer resort by plane. I think you need to read more about how to get the most out of timesharing and going to different resorts and planning ahead. There is no question times are rough now, but I am suggesting a way to get through this period and to hold onto your unit.
I think you have a opportunity to work on.