Get a good piece of flexible but fairly stiff or thick plastic from like HOME DEPOT or LOWES and glue or duct tape it into a suitable cone secured to the collar.
It can be a stiff plastic that's merely bendable enough or it can be a pretty stiff but thickish plastic such as the carpet runners that tend to be clear--though those have bumps on one side that tend to need to have their sharper points trimmed off with a sharp knife or strong sissors.
Please let me know if you can't find something and I'll see what other ideas might work.
Thanks
The two pups are poking around in it when I turn my back. thats where the lampshade ended up on the 6mo old tyrant.
Non stop antics today.