G'day Milt and Welcome to the Forum:
I wold put treated 2 X 4s down with PL400 and Tapcons or Ackerman Johnson screws. Then cover the deck with composition or plastic boards, placing the 2 Xs so the water can run down hill under the deck and install the deck boards across (or perpendicular to) the sleepers.
It is possible to build a step out of the deck boards and glue it in place.
Please let us know how it goes and mabe some pictures of the project.
Glenn
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