thimble for blind cutt

Another Dyson proposal:
FOLKS KITCHENWARE FOR THE BLIND

https://www.jamesdysonaward.org/2018/project/folks-kitchenware-for-the-blind/

In my opinion, it is not the best solution (for the knife):  it is a special knife, limited cut (the defense will kick back when it lifts up 90 degrees), need to be cleaned (space between defender).

If such a problem really exists for blind people, my solution would be like this:

Silicone thimble for one or two fingers with a small hole for finger tip (to make one feel the edge of the loaf) S shape sliding edge for quick safe chopping (with metallic cap).  Easy to wash, cheap.
(the knife is a common one).

Didn't check may something like this already in use for common chopping.