The more "realistic" approach would be to re-create a fully functioning brain in a fully functioning body, in a real world environment. This would seemingly increase the complexity of the problem exponentially, but might make the idea of reproducing consciousness captivating for those who take pleasure in pondering hypotheticals.
Indeed. Maybe in the far future, lab-grown clones - independent of the usual way of creating humans - will be able to be grown. They would arguably have consciousness, but there's a whole genre of sci-fi where lab-grown humanoids and cyborgs create issues. For a humorous take, see the Murderbot Diaries. But this angle still doesn't address the transfer of an older person to a younger body (see John Scalzi's Old Man's War for an interesting and often humorous take on this): What's being transferred? Even brain or head transplants present an infinite number of issues (See Mr. Humble and Dr. Butcher for a fascinating nonfiction book on that!!)