So I completed the job

and thought I'd post some pics with a good idea, IMO, that I stumbled upon!
Desk Grommets!

Those little friends that slip into a (perfect-sized) 2.5" hole in a desk to help organize monitor cables and the like. Popped one on each side of the hole through the wall (drilled with a hole saw) with a 2" dia. piece of pvc pipe inside the wall. The little cover with the hole slipped right over the snake cable after running it through.
My only regret is using Gorilla Glue that flared up a bit more than I thought it would where I over applied. Oh well... from the pics you can tell the building is in questionable shape as it is. Most importantly though, it's not going anywhere.
Thanks for all the insight and quick responses everyone! Another reason to love gearslutz.