It's basically the same patch as ML (thanks nawcom) except for the second jump.
10.8
3b31 je -> jmp
46e3 jne -> jmpq
81fa je -> jmp
10.9
3cfe: je -> jmp
498b: je -> nop
dad4: je -> jmp
The problem I was having (crash after language selection) was because of codesign, fixed with
codesign -f -s - OSInstall