If you're at the tip of the ledge, you're most likely going to die after the Raptor Boost. However, I think it's easier to pull off at the ledge, and leaves the MK with less time to react. It might be the only true way of doing it, as well. You can survive on BF if you do it on the two mid platforms, though. I only recommend this near the ledge (in many situations, I don't recommend this at all), as AR > Usmash is better for KOing MK, but this has its uses and shouldn't be taken for granted.
Has anyone tried AR > Run-off > FF > Falcon Dive? It could suit better than Raptor Boost, mainly because you have a chance to survive. It's really good if the MK tries to use Tornado to recover or possibly Shuttle Loop in an attempt to escape an AR setup.