I can barely reach a 10th, so this is almost entirely impossible for me. I can sort of do it, but there's WAY too much arm movement needed for me to achieve it. There's too much splaying of my fingers to achieve it. How big are your hands???
I can reach an eleventh comfortably, and a twelfth if its white to white or black to black.
Why jealous pp? No composer will seriously use a lot of 11ths and 12ths unless they want their music to alienate itself from being played! Just break them and say please to those composers works Or use your big toe!