Even when I was buying the OKW resale, I figured that one day I would add-on at VWL. I love the lodge and that setting.
I didn't think that I would add-on this soon but, yes, with the feeling that it would sell out before the end of the year, I decided that I needed to go ahead. Then with the price increase coming, if I was going to buy anyway, there was no logical reason to wait until the price went up.
I feel that although very different, that VWL will be like BWV in that when it is sold out, it will be important to have the 11 month booking window. I think you will be able to get in after the 11 month mark but might not the dates or number of days you are wanting. Just a feeling on my part.