About the step: could you cast a negative mold with something rubbery, fill it with concrete, flip it onto the step while it's still wet so it dries in place, and then peel off the mold?
I seem to remember from The Whole Earth Catalogue that there's a barrier cream you can smear all over your hands and then the concrete comes OFF your hands like a glove because it molds to the barrier cream.
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About the step: could you cast a negative mold with something rubbery, fill it with concrete, flip it onto the step while it's still wet so it dries in place, and then peel off the mold?
I seem to remember from The Whole Earth Catalogue that there's a barrier cream you can smear all over your hands and then the concrete comes OFF your hands like a glove because it molds to the barrier cream.