You could probably also add .3mm spacers to a Campy 11sp and drop one cog. The largest 3 cogs are joined so the spacing there wouldn't be quite right, but the largest cog is set by the limit screw, and the smallest of the 3 would be right, so that would only leave the 2nd smallest slightly off. SR and Chorus have 2 combined cog groups, only the lesser models have loose cogs.

It might work if you absolutely had to do it.