I have a mill at home, and to machine that, from Ti, to even come close to matching, I would charge more than that knife costs.
And I know what ZT knives cost.
The other side is "3D Machined" on a 5-axis CNC machine. I don't even want to think about the code for it, but it's more complex than anything I've written. Without the code to start with? Ugh.
Milling it by hand on a 3-axis machine would be a TON of work, with very little room for error at any point.
You might contact ZT, since they have the code already, but stopping their line for a custom project might well cost a pretty penny as well.