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Don't bother, just release a 60 dollar port of the first one minus a bunch of features like wireless, inferred, online, pokemon transfer, etc.
Cut everything that isn't native to the original Black and White.
Add in the battle tower from X and Y, but replace any unique trainer with generic trainers that just say the lines of the character they replace even if it makes no sense.
Oh, and be sure to lock people out of Home for a year or two.