Cheers for the input guys! There are a few ISO (English) 1856s on TaoBao, at "85 - 90%" condition, starting from 238 Yuan (some 25 Euros).
There are also a few NEW MY1800HAUs for 150 Yuan a piece, but regrettably they are ANSI layout. At the moment my plan is to pick one of these MYs and use all the caps I can, and also pick one 2nd hand MX1856 for those ISO-critical keys. How suspectible are these Cherry corp doubleshots to getting shiny? The "85 - 90% condition" part worries me a bit since the attached photos are not of much help.
Still, the ultimate plan is to go the grey/beige route.
Edit: OR I could get me a G80-9009HAU off TaoBao since that has DS-caps-a-plenty... The "Attach" -key would seem to be of proper length to be used as right shift, but would the profile fit as well? Similarly, could I use the plentiful single width grey ones as the 1st row keys or do they differ in profile?
I would still be short a fitting spacebar. :/