Slur within a slur?

[Peter Mayes]

Here is a fragment of something I am engraving.

  e( dis e ais, b g |
  e8) r \afterGrace d'!(\trill { cis32 d }  |
  c'!16) b^. a^. g^. fis^. e^. |

The D following the \afterGrace is slurred up to the C at the beginning of the following bar.

I would also like the "{ cis32 d }" grace notes to be slurred, but if I put "{ cis32( d) }", I get a "Warning: already have slur".

Is there a way to get a "slur within a slur"?

Thanks in advance

-- 
Best wishes -- Peter