Is it possible to cultivate Sharingans?
In short not possible. 
When madara was called by endo tensei he had his sharingan, even he showed the five kages the power of rinnegan . When he was brought back to alive by Obito, he was blind as his original eyes were given to Pain. This proves that you can't simply use endo tensei to manipulate body parts. Releasing a person from endo tensei simply means he/she is free to move on their own will, just like madara when he managed to release himself from kabuto's control.