Have you been able to confirm if any of the pads on the board are connected directly to the diode?
It would be so much easier to solder to those, than disassemble the module to gain access to the diode pins.
I wanted to make a simple solution, as plug and play as possible so others (who aren't engineers) could follow them. That's why I used the jumper and wire to connect the PWM signal, rather than just soldering to a pad.
So far everything can be done except the diode connection.