Mizhara:
I believe it is discussed somewhere that clone brains are, themselves, artificial: a sort of bioelectrically-active gel that can be imprinted into a particular brain structure as needed. I forget where; it's been nearly a year.
Regardless, the clonejack is a verified "thing that happens."
See, e.g.,
One Man Too Many." The details are mostly important in working out the nature of a person who could gain such access: the options range from a fairly conventional identity thief (the implications of which are horrifying) to an organized crime or governmental agent or client of same.
Samira:
Sadly, I have a taste for pretty toys such as T3 cruisers, and the skillset to back them up. Training back to the point of being able to go roaming around nullsec with an all-aspect explorer Tengu (It probes! It fights! It hacks! It hides!) would take a while.
In fleets, I favor acting as scout and/or Ewar, and I've pretty much completed training in that role. One of the very first skills I ever took to 5 was cloaking. It took a month, but I've really never looked back.
The road was a long one. I'm a little disinclined to repeat it.