To start with when you remove the wings carefully (a few hours work unless you're skilled
) they can be re-used.
And removing them (if necessary) will provide proper access to any hidden rot.
As for the initial question I am not sure what the extent and exact location of your problem is.
But bear in mind that as a rule thumb most of the rust is hidden from view. So pictures might help!
These were both rather solid looking wing areas ...