A telepath wouldn't be able to, but they could use tech and just download them into Cerebro (which is basically a computer). Consider the synthezoids' origins - they all have someone else's brain engrams, so were created that way in the first place. Ultron is based on Hank Pym, Jocasta is based on Janet van Dyne, Vision is based on Wonder Man, Viv is a combination of Vision and Scarlet Witch. Not sure about Torch, but he and Jocasta are in fact synthezoids too.