A friend of mine who has a Persian cat had one in the past he trained to use the toilet AND press the lever to flush it afterwards. He told me this only yesterday.
When I was a kid we would always swim in the creek water holes or local farm dams and take our home made tin canoe made from a sheet of old discarded corrugated iron with the holes patched up with road tar. That was 65 odd years ago.
Maybe persian cats are easier to train. If any reader has trained one before I’m sure my friend Jon would like to see the reply.