To state, 'not a chance' is quite profound and sounds like it is based
on lengthy research. Yet, you state very little is known about all the
variables. This is perhaps correct at the moment but seems logical the
opposite may be the case within a few decades or less with intense
research and experimentation.
As for the clone in question 'not being a carbon copy', that seems to
merely recycle the tiresome old saws that it ain't gonna ever work for
one reason or another. There are millions of examples of scientific
advancements that didn't work at first---or for the first ten years---or
the first thousand years. Everything from shatter proof glass to
vaccines. They didn't work for one reason or another but eventually the
flaws were corrected. Hence, you are incorrect, it could and most
probably will work eventually.
And lastly, the 'clone' in question does not need to be a carbon copy of
the starting material. The point in the search for great long life is
usually lost on those that assume we speak of an exact replica of
ourselves. Not the case. To achieve great long life, one needs to
transfer ones existence into a new vessel (not an identical one) before
that spark extinguishes.