Wow, that was a though one to follow.

I think this is what you're asking...
Once you've borrowed points into a use year, you can use those points within that use year like any other points -- with the exception that you can't bank or transfer them.
So, if you borrowed them for a night at the BCV, but would rather use them towards OKW, that's fine. Simply cancel the BCV night and re-use those points for the new booking.