Use armor with lowest possible AR, put 5 sup runes on it and, pull enemies to a res shrine?
I assume you could also use them with the pet leveling thingy.
I did blood is power to my hero until i died and was rez'd with flesh of my flesh. occasionally using healing breeze on him to make up for health loss. Incredibly boring, but got through the canes. Get to 60 dp and click 4 canes is faster than 1 at a time
I have your same problem and i found that Bip + 3 UA heroes is surely the fastest.
Currently i'm doing it at the beginning of ATFH: flag heroes kust outside the lava, walk in and use bip. Sometimes you will also be attacked by the immobile destroyer near the entrance, and die really fast...