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There is one good alternative though that will work:
You said the floor joists are accessible from beneath. Go underneath and install 2 x 6 blocking at 16” on center between the floor joists. The 2 x 6s should be approx. 14.5” long to fit securely between joists spaced at 16” on center. The 2 x 6s should be placed with their 1 ½” side up tight against the plywood sub floor. This will effectively give you the same support as the joists for nailing the new plank flooring and you can turn the planks any direction you like.