System for choosing RGB or CMYK elements

Dear all,

my print shop just rejected my last context created pdf job because some 
objects where rgb and some cmyk. For many good (or bad) reasons for too 
long I delayed my plan to establish a system for choosing the right 
elements according to the selected mode.

In short I want that context chooses cmyk elements when I use the 
mode=isocoated for example, and when I use no mode or mode=web it shall 
use rgb elements.

We have a lot of SVG graphics which are of course in rgb.
I learned that I can convert these svg files via Scribus to cmyk pdf 
files. This is just tedious work, but I guess unavoidable.

So I will end up with lots of files named filename.svg (RGB) for web 
pdfs and filename.pdf (CMYK) for print pdfs.

I think  of using \setupexternalfigures inside startstopmode[isocoated] 
to restrict method to pdf or something like this.

Is this feasible?

Or is it better to create files with a naming scheme that hints to the 
color space like cow-rgb.pdf and cow-cmyk.pdf and use the right file 
explicitly in the context file? I don't like this idea.

I know that I also must have a good solution for raster images.

What do you think? How do you solve this challenge?

TIA and Ciao!
juh
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