Like all your stuff, this is very cool. Keep up the good work and making awesome things!
By the way, are you aware your background is in Korean and it's upside down?
Yeah, I can see that... as far as identifying the rebar. Perhaps before blade design, heat the handle length then tump it down so the area is thicker than the standard rebar size; it will maintain the ridges seen on rebar. If the handle is too thick, which it most likely would be, file off enough of the sides for a good comfortable thickness. As a result to taking off the sides, you would have a unique oval shape where you could do filigree work... or something cool looking. If you want, I could make a drawing for visuals?
I love getting creative, especially when I'm cooped up in a house where I have no shop to play. (I used to make wood swords and daggers for fun.)
I'm more looking at the background than the knife