Wankan is not often practiced. It's a kata that I didn't care for until I leaned some bunkai from Iain Abernethy. This video will be helpful if you are trying to learn the kata. There are three variations that I have encountered for the opening movements which I go over in the video.
Nice breakdown! I’m pleased my thoughts on the kata helped. The footage on the bunkai can be found here (Andy was there, but out of shot :-)).
All the best,
Iain
Really appreciate these resources, as always.