It is not clear to me what changes I have to make in UnrealHeaderTool.target
You can try looking at the end of lecture source to see the file they have.
Are you experiencing slow compile times? Having the project on an SSD will help and having the engine also on an SSD will help a little more.
Also, have a look here - found this link in another thread which is worth looking at:
Extremely slow compiling - UE4 AnswerHub (unrealengine.com)
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