In the process of toilet training Kitty Kat. Bought a Litter Kwitter, It's a pan that fits on the toilet with removable center litter trays that have a hole in the center. Each tray has a bigger hole. The idea is to get the cat using the pan that fits on the toilet, then replace the center tray with one that has a bigger hole every few days eventually removing the pan from the toilet.
So far I have successfully moved the current litter box to the bathroom next to the toilet with no accidents. Next is to replace the current litter box with the pan and tray with no hole, then move it to the toilet.
Hope it works, will be nice to not have to mess with not only cleaning the litter box, but also not having the expense of buying cat litter.