I've just done this and it was a right git to do. I ended up removing the air filter and ECU unit, and loosening the breather just enough to get some very, very limited access. I didn't want to take the breather off completely because getting that rear nut back seemed like an impossible task, so I just loosened it which allowed me to displace it enough. There's a video on YT of 2 guys doing one on an SPI, but they didn't have to move the breather at all and I can't see how they had access. Is the breather in a slightly different position on the MPI?
Anyway, the job is done and I'm just thankful the nuts were easy to undo. My hands and forearms are now nicely bruised and scuffed up!