Two thoughts. First, I think your nested idea wouldn't work; there's stress on these components and you need to vary both pulley diameter and number of clicks, and you are always going to lose in your garage all the outer layers you aren't using. Second, the length of pull is a little more subtle than implied by the Shimergo tables. There's a progression of pull length to try to get linear motion out of the RD which pivots in a circle. The reason C10 shifters work on S8 cassettes and derailleurs is that the 1st and 8th position are controlled by the stop screws on the derailleur and only the second through seventh clicks need to be a reasonably close match. I found this last year when I was studying, but I can't find the link right now... it was an older forum post from pre-Shimano-11. Some of it is out of date about newer hardware, probably.
At the time I was trying to find a way to get brifters to index a NR derailluer - I've gotten over it since then.
Campy 10 shifters pull an average of 2.83mm of cable per shift, but that cable pull is not uniform. The first five shifts are only 2.5mm, the next two are 3mm and the last two are 3.5mm. SRAM shifters pull a uniform 3.1mm per shift, so even Campy 10 shifters are really not a good match with SRAM RD. I know that Lennard Zinn posted info about a Campy/SRAM setup but it makes no sense to me. It would take a Campy shifter 6 clicks to pull enough cable for 5 shifts of a SRAM RD. That's a major error.
The 11 speed shifters would be far worse since they only pull an average of 2.6mm per shift and those pulls are not uniform either.
SRAM's 1:1 actuation ratio is used on their mountain bike components, not their road bike components. You cannot, for example, use their mountain bike derailleurs with their road bike shifters for a touring setup. The road bike actuation ratio is around 1.4:1, which is what Campagnolo used on their previous iteration of indexed shifting (pre-2001). Their cable pull at the shifter is linear so every shift pulls the same amount of cable for every shift, which is different than what Shimano and Campagnolo uses. Suntour was the only other company that I'm aware of that used a linear cable pull at the shifter but they spaced their cogs accordingly. Shimano (and SRAM, by default) use evenly spaced cogs on all of their cassettes and Campy's cassettes are almost evenly spaced. How does SRAM get away with it? They have that little linkage arm thing on their derailleurs that allows the derailleur to move the same amount for a given amount of cable pulled whether it is at the beginning or end of the throw, unlike Shimano, Campy, and Suntour indexing rear derailleurs, which move less as the derailleur moves closer to the spokes.