Toilet blocking and toilet solutions

Hi, I am the father of an adult autistic son who at times is obsessed with putting items down the toilet. This has caused numerous blockages with associated callouts. He lives in a house on his own with 247 care with regular stays with my wife and I. It is a real issue that commenced in a poor placement some years ago. 

Has anybody experienced this and is there any physical toilet solutions that anybody is aware of?

Kind regards

Ian