This is really interesting- I don’t know much about knot magic! Although I have heard of a knot ceremony during bonding ceremonies (kind of like marriage between partners) where some pagan practices use Handfasting. I would consider this to be a kind of knot magic!
[Picture from Waterlily Weddings]
I believe handfasting comes from Celtic traditions and the ceremony looks really beautiful. I am considering doing something similar with my partner, as neither of us want a traditional marriage in a church. This looks like meaningful and beautiful ceremony! 