This was my solution to disabling dGPU on a A1398 820-3787-A board.
1. Jumper from LCD_MUX_SEL via to C1099 pin 2 (Pulls to ground)
2. Jumper from pin 1 R9626, pin1 R9627 to pin 1 C9700. (Provides voltage)
3. Jumper pin 11 U9700 to pin 2 C9700 (Pulls to ground)
4. Remove R9623 (Remove pull down resistor)
5. Jumper pin 1 R5335 to pin 1 R7780 (Turn backlight on after sleep)
6. Remove inductors L9330, L9360 to entirely disable the dGPU so that MacOS doesn't see it and the dGPU won't show up in system information.
My only issue after this workaround...
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