Why would you even risk such a thing? I would never place an ichy fish in my tank, not even as food, even though my LFS told me that the fish that ate the sick one would not get sick also... I just wouldn’t try it... The best thing that I can recommend is running a uv bulb, I run a 55 watt bulb with a 633 gph pump that pumps through my chiller as well and its been doing an amazing job at getting rid of the ich I had in my tank.
I also used copper-safe because i have a fowler set-up.