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I would like to tryout the "slap chop" technique but was wondering if GW's contrast paints can be desaturated like regular paints can? With regular paints, adding a little grey or brown usually does the trick, but how could it be achieved with contrast or speed paints?

I would imagine by adding a bit of normal brown or gray.
If you are worried about contrast paint losing it's contrasty property by mixing normal acrylic paint into the contrast paint, I would recommend to do a lil test and see if the result are workable or not.
If not, I would look for an option to buy the exact "desaturated" color that you are looking for from their color line.
If they don't have what I need, I would buy the color-wheel-opposite color from the one I am planning on using and mix the two until I get what I need.

This is a solid resource that demonstrates how the character of paint can be edited. Hope this helps.

Awesome! Thank you for the information!

You could also test to see if different colors for the underpainting will accomplish the desaturation effect. Browns instead of greys?

That's a great idea, thanks!

Yeah, using a light grey primer or brown preshaded undercoat rather than a white one is usually how I go about it. You could try mixing some grey contrast in, never tried it myself, give it a go and let us know how it comes out.