Huh - I replied to this last night, but my post seems to have gotten lost somehow.
The Japanese method of using a "hikari-ita" to transfer the profile of the end of the hari to the keta is standard practice. There's also a method using a pair of sticks that are connected to a pair of crosswise sliding bars that can be set to the profile of the har and then transferred.
I went into some detail last night, Brad, on your comment about not getting why you would turn a keta over for layout, but I'm feeling like not repeating myself. Why don't you share with us your perspective on suitable methods, and elaborate upon what you find puzzling about moving the keta around for layout?

Chris