Renaming spot colours

[Duncan Hothersall <dh@capdm.com>]

More questions!

I'm using black plus one spot colour in a document, and I include PDF 
images generated in an external program (CorelDraw) which use the same 
spot colour. In the images the color is called 'PANTONE 294 CV', but I 
can't use that name for my colour in ConTeXT because names can't contain 
numbers or spaces. So in ConTeXt I define
\definecolor[PantoneTwoNineFour][c=1,m=.56,y=0,k=.18]

The end result is a file with two spot colour spaces instead of one. Is 
there a way I can combine them, either by a last-minute renaming, or a 
mapping, or a pre-process, or something? (I tried the brute force method 
of search-and-replace on the PDF file but there must be binary-encoded 
references to the names as well as ASCII ones, because that broke the file.)

Any help as ever greatly appreciated.

Duncan