The discrete GPU (dGPU) is soldered on the motherboard and iGPU is internal to the CPU chip which is also soldered so there is no "automatic tool" that can be used to replace the GPU on MBPs.
Let me give more explaination
I'am looking for a bga machine to replace gpu's on MacBook pro?
So what is a good product price for a good one ?
With automatic and fine callibration