Elan,
Try phoning WM's Exchange department to ask. Perhaps WM's "Exchange Plus" program has been updated to include RCI Points resorts/deposits??
While I haven't used "Exchange Plus" in years, it allowed Worldmark owners to convert both RCI Weeks and II deposits into WM credits. The number of WM credits received ran roughly 80% of the standard grid used for booking RCI/II weeks against your WM credits. So, if a 2BR Red week required 10k to book through RCI or II one could expect to get 8k credits using the reverse exchange through "Exchange Plus."
I doubt the program has been updated for RCI Points ... but it doesn't hurt to ask??