This might be a long shot but I've gotta try!

As people might know, tall tanks are one of the more difficult to aquascape. So I have a 30g tall, 2-3 medium sized rocks (about 20 lbs or so). My goal is to re-scape my setup as to have more rock along the back and into the upper half of the tank, allowing more space to place my coral and at the same time providing various 'higher' spots for the more light-demanding coral.

I'm trying to avoid drilling and epoxy if at all possible. What I'm looking for is a good tall live rock (or 2?) that would allow me to do this. With my poor MS-Paint skills, i've illustrated below what it is I'm sort of looking for

ANY help would be greatly appreciated!