inspired by the black stalker underbog heroic exploit, i thought of another instance in which the final boss is close to the entrance.
i did this with a 70 holy pally.
just clear those 6-8 mobs until u are facing pandemonius. head to the right and die under this small balcony.
now use the "spirit walk" exploit to get your ghost into the instance by clicking "Release spirit" when u are almost logged out.
Now with your ghost in the instance just walk through it to the balcony, rezz up there and get your partymembers killed under this balcony, rezz them and kill the nexus prince. good luck.
view from the balcony:
behind the nexus prince: