Tldr: it should have been in the corebook
Awesome stuff. Blades open magic system can be overwhelming; I've always thought it would benefit from having a bigger list of sample rituals or at least some thematic suggestions. Dedicated magic supplements are my favorite kind of RPG book because they go deeper into flavorful details; when I saw the preview ritual I thought "well, even if it has just one other like this, I have to see it", and this book is choke full of ingenious ideas that make every ritual worth a separate story.
Thanks Will.