Note sure if this is a repost.
Its still possible to get past the gates without banging the gong.
First you gutta do the normal jump up the wall trick (easy if u just face the wall and jump then tap forward, repeat, do on the west wall)
Then delete hearth and use autounstuck which will teleport you to the other side, then you can just go clear all chests without a timer.
Note: The bear mount is still not 100% drop rate while you do this, but its still much higher than normal, 30~% appx.
Benefits of this include: No timer, get all 4 chests, high chance at bear mount.
WARNING: If reported Blizzard will remove the mount, badges, and give a 3 day ban, just happened to a guild who have 6 bear mounts on my server