A lot of people will drift in, even when late apexing there. If you can time your closing speed to turn in on the passee's outside as they turn in, you pretty much guarantee the line into 5a. It's a slow turn and there's plenty of room off the apex line. It's actually not a rude pass, as you are pretty visible throughout the pass. You are clearing the long way around that ends up being an inside pass down the hill. All they can do is wait till you're clear to flick over into 5a.
It's worked best for me in the first lap of a race, as everybody slows and plays follow the leader. They can't go forward quickly due to the pack and there's room off apex. I've picked up 3 places there with that move.

but it can be used if you've been following someone for a while and know where they'll turn in. I don't recommend for trackdays though, LOL
Its not that bad to abort before the apex and even if you get around and not clear of the rider you can pretty easily check up down the hill to abort as well before turning into 5a. Has to be timed pretty well, but again works best in first lap situations.
Besides...how do you "stuff" someone from the outside, taking the long way around? The passee is only at risk of being surprised someone can go 'round there and only delays their turn in for 5a.
Y'all know I ain't fast, this is just something I ended up trying once and it worked so well, I've done it a few times when the moment presented itself