> Since it is possible to search for only 'á', it would be nice to have
> some convenient way to search only for 'a' with no accents.
>
> The only convenient interface I can think of is that you type, in a
> postfix input method, a ' DEL.  Currently that is equivalent to typing
> just  a.  But we could conceivably make it different.
>
> Can someone think of some other interface for this?

You can toggle off char folding with M-s '. That's the same number of keys
as this idea where you would type an accent and then delete.
Of course, one affects the entire search string, while the other would only
affect that specific letter.