You can transfer to another member current use year points but not banked or borrowed points. Transferred points retain the use year and home resort identity of the transferor. The recipient can bank them after transfer but only if your banking window is still open.
Thus, if you could find someone who would do the transfer, you could transfer to them your Dec 2013 points but not the borrowed Dec 2014 points, and the recipient would need to use the transferred points for a trip that ends no later than Nov 30, 2014. Thus, you need to find someone who wants the points for a trip that will take place soon and that person is not going to accept a transfer unless there is actual room availability for the time they want to go, and that could be unlikely this far beyond the seven month reservation window.
Since you have two use years, it is the same as if you are two members. You could thus transfer the points to your April use year but the restrictions would be same (you could transfer only current Dec 2013 points, they would retain their Dec use year, and they would have to be used by Nov 30).