You could just offer (with the alternatives maybe making it a "can't refuse") to put the inventor to work doing something more benign and pay them for their ski

You could just offer (with the alternatives maybe making it a "can't refuse") to put the inventor to work doing something more benign and pay them for their skills. You could even let them do side projects like these at the lab so they get to scratch that itch. Not everyone needs to be disappeared.