The CPU on newer iterations of laptops is soldered down to the motherboard, they are not socketed anymore. At least not that I have seen. Besides that even if you could the bits you want are not in the CPU, they are in the firmware (PureBoot).
I think a more realistic approach would be to attempt to port the firmware (PureBoot) to another laptop with similar hardware (same CPU/iGPU) and flash it to the SPI on that device.
I don’t think that would be that straightforward either though, you would need to be familiar with flashrom+SPI programmer and be able to port the firmware over to the other platform. The source is available on github if I’m not mistaken, but I still don’t think it would be that straightforward and it would run the risk of bricking the device if you’re not able to recover from a bad flash.