So when you blink left, the right blinker turns on too? That violates FMVSS 108. "The purpose of this standard is to reduce traffic accidents and deaths and injuries resulting from traffic accidents ... so that their presence is perceived and their signals understood" Pray you dont get rear-ended by a car with a dashcam.
I applaud your ingenuity and give you an A for effort! My OCD would probably have me tearing those out and reorienting the LED strips the other way. FWIW, my aliexpress set came with plug n play wiring harnesses that tap into the existing circuitry without any damage - IIRC the lights come on and stay on with the headlights, get brighter with the brakes, and sync with the turn signals (correct direction and one side only) and hazard lights. I'm wondering if you contact them, maybe one of the vendors could sell you just the "Y" wire harnesses?