Kodachrome process adds the dyes, rather than them being resident in
the emulsion when unprocessed, so Kodachrome films are generally very
stable in extreme heat conditions and preserve very well indeed in
the refrigerator or freezer. I haven't shot Kodachrome in many years,
but I used a LOT of it in the 1970s and 1980s.
I'm not sure what the big problem in scanning it is.
http://homepage.mac.com/ramarren/photo/PAW2/02.htm
I scanned that with the Minolta Scan Dual II and Vuescan in 2002,
from an original transparency I made in 1981. That exposure was made
on 6 year out-of-date film I had in the freezer from when I worked at
a discount store selling photo gear a few years before that...
Makes a superb 11x17 print.
Scanning Rule of Thumb #1002:
The scan is NOT the finished product. Scan to capture as much of the
image data to digital form as possible. Render that data in with your
favorite image processing tools to the photograph you want.
Godfrey