i dont think anyone has found one, yet, sorry. I serched for one when i was using my 3850, and couldn't find one then, and still (though honestly i don't search much anymore)
dont expect anyone to implement this.
this task is nearly impossible.
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I used to think, that the universe is a random caotic sequence of meaningless events. But i see now that there is reason and purpose to all things.
Jerry Seinfeld
In fact, your best bet for the foreseeable future is to get an SD-to-CF adapter and use an SD card as your only memory. A few vendors (Minolta in particular) sell an adapter where the SD card fits "perfectly" inside the CF adapter, so that you can use it in devices like a digital camera.