[Potty Training] Design a kid-friendly toilet flush

Hello fellow dads! Long time lurker, first time poster here looking for genius dad advice! After a year of cleaning poop and piss on the floor and underwear, we have successfully trained our little one to potty train! He goes by himself to take a leak or poop but still needs assistance to clean his bum 😂. Here's the problem, he knows he needs to flush but the problem is, here in Australia (yes, we are real and no we are not living upside down.), we have a half flush and a flush flush type of flush and it's a little hard to push it for little kids. Has anyone had this problem before and found a solution with spending too much money and replacing it? I need dad brains please! Thank you!