Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 5 months ago

Bismihi ta'ala

Yes, it is permissible to get a hair transplant, as the hair will become a part of the body, and it will not create a barrier or an obstacle to prevent water from getting to your skin while doing wudhu'/ghusl. 

The problem could be if the hair does not grow, and whether this would become an obstacle in ghusl and wudhu' being valid. For this case you must refer to your Marja' taqleed.

And Allah knows best.