These are our steps in a dry stack wall. You could also add something like this onto the front of the wall without actually disturbing it; you would only hide a portion of the wall behind the stairs. It would waste some stone but at least you'd be fairly confident of structure, as the wall would remain contiguous.

KarinL

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30" is tall for dry stack. If you try to embed steps, you would have to totally redo a large area of the wall. You could do what karinl suggests using matching stone. You will probably have to mortar the steps unless the wall is made of 4" thick stone.

We've got a few extra stones that we might be able to use. My DH isn't as fond of the natural look as I am but we could put some of the rocks in place and see what he thinks. The wall is about 12-15" thick.