Is there anyway to hack a steamer?

If I remember correctly, Alton brown punched a bunch of small holes (small enough so nothing falls through, but large enough to allow circulation) into several disposable pie plates and kept them elevated with balls of crumpled up foil.

If you have a large stock pot with a lid, get or cut some chicken wire to fit inside. Lay it on top of 2 small bricks to elevate above the water.

a colander set inside a larger pot? Cover with foil if lid won't fit

Possibly use a rice cooker or a slow cooker on a very short cycle.
And omit the plastic bag the recipe mentions.