Yes it can be done , no you don't have to take the box apart.
After watching u tube video I bought a tool from Tri 750, Al,
and gave it a try.
It took some time but with patience and Al's guidance I was able
to remove the tumbler for a re key .
Just for grins I asked my local dealer who said the only way was
to disassemble box, 3 hrs labor
If you have the need give this operation a try.