You won't be able to switch both pickups with a single push-pull unfortunately. According to your diagram, yellow is hot and white is ground for one of the pickup modes and blue is hot with green the ground for the other. The push-pull switches are simply switching between the two pairs of wires. Unfortunately, this means that you need both poles of one of these switches for each pickup, thus why Schecter includes two. Likewise, the 5-way idea suggested earlier also won't work, at least not with a standard switch.
In theory, I believe a 4 pole switch could accomplish what you want, though I'm not sure that I've seen a two position 4-pole switch before. 5-way, 4-pole "super switches" are pretty common and may work for you, though I've never wired one and they strike me as something of a pain to deal with.
Ups, i explained myself wrong!
I want to coil split the pickups with the volume push/pull and the pickup switch with the 3 way switch.
Do you think it's possible?