YUMQUA Finger Mouse, Handheld Trackball Mouse Fingertip Mini 4D USB Hand Held Wired Pointer Thumb Ball Mice with Roller for Laptop Mac Window Computer Fits Left and Right Handed Users

You can learn to mouse with your right hand; swap the buttons and it will be a lot easier. It takes about 20 hours for your brain to make the switch. Otherwise try a thumb mouse, specifically one like this.

This listing has 600 reviews: https://www.amazon.com/YUMQUA-Y-01-Portable-Trackball-Computer/dp/B00DT2Q9OM/ You can also find it on aliexpress. It's not a brandname controller, it's generic and sold by many drop shippers. I wouldn't get it because it's wired and it's not even USB-C, it's old USB-A.