I remember trying a home made cardboard one that worked pretty well. Make it just big enough for him to stop messing with it.

I found this link with some suggestions while trying to find a picture or video https://pangovet.com/pet-lifestyle/cats/diy-cat-cone-collars/ they make a paper plate one which is the same idea. Might be a good place for inspiration.

He’s beautiful! Reminds me of the black cat I had.

I forgot all about those old cat wall clocks.