Probable cure
I have been looking at my DN01 very closely and I think it is possible to make a wrap around crash bar.
This can be done with the right technology.
If the bar could be fastened somehow with brackets to the frame downtubes, then wrapped all the way around the front end to the other side and fastened on that side with brackets, if it cleared the front wheel mudguard and the plastics, I am sure it would look ok with tubular chrome, especially if was a double tube, one above the other.
Just a thought, maybe someone could come up with a better idea.