I tried the tactic last night.

It went so-so mostly because 2 people were just gawking at me, and later games they just couldnt go as a group.
The horde only got past me 2 times, but i eventually gave up on WSG... It sucks so hard.

I found 2 things i forgot to mention in the first post: your main needs to stay "loose" with the alts stationary until you need to move.
And secondly, in addition to keeping a magma totem at the "entrance", have an earthbind totem a little further out.
This will slow most runners enough to kill. (except those darn rogues)