There's a slim chance you might get lucky, it's not unheard of for folks who buy resale contracts in this situation, but there is 1 scenario where you can unbank points. I know because I did it.
If you purchase an additional
DVC interest, they'll let you modify an existing reservation to use the newly purchase points, and can restore any borrowed points to their original UY. I was able to return 50 points to their original UY when I bought my 25 points direct.
From Article II, paragraph 5, B, 2)
I know that's not super helfpul for your situation, but I thought I'd put it here for anyone in the future searching for an answer like this.