I've just been looking at Japanese crests earlier today.
At the moment I'm contemplating buying what looks like a wonderful quilting book containing 30 patterns for Japanese Crest quilt blocks. And I'm sure the outlines for the patterns could be enlarged/made smaller for making a template for quilting outlines.
It's on Amazon, but I'm not sure how to do a link.
"Circles of The East: Quilt Designs From Ancient Japanese Family Crest", by Kumiko Sudo.
Hope it's what your're looking for.
Joanne