Make context to not see forced slur positions?

Hi Lilypond users,

I basically have two working templates, because they vary widely in settings.
One for single instrument scores, one for the full score. Both have \includes
to the actual music.

Now it can happen that forced slur positions...
("a4 c_( d e | f g) a f")
      ^

...look good in the single, but bad in the full score. There I'd prefer it to
not see the forced slur and do the positioning by itself.
Is there something I can do?

Best regards
Michael