Blow up the wall in advance, and cover it up with AR, holo, and Trid Illusion. Then make the IMAGE of busting through!
Or, hit it with a Ram spell. Or some very big Earth Spirits.
And if it's made of that older durasteel, use D-7 Catalyst spray to make it look all pink and gooey. You'll pop right through. Not as dramatic, but then, you ARE busting through steel walls...