SWIM as professional pessimist higly doubts that this will work. Look at link:
http://themerckindex.chemfinder.com/TheMerckIndex/NameReactions/ONR233.htm (http://themerckindex.chemfinder.com/TheMerckIndex/NameReactions/ONR233.htm)
233.
Letts Nitrile Synthesis
E. A. Letts, Ber. 5, 669 (1872).
Formation of nitriles by heating aromatic carboxylic acids with metal thiocyanates
These old funny reactions almost always are fairly limited in scope.