Good question. It is silliness in my mind! Really a graduated reticle in MOA or MIL is a much better way to go anyway so I would encourage you not to worry about finding one in FFP.
With a graduated reticle with fixed hash marks you can shoot any load at any environmental condition and still be perfectly accurate and confident in your shot. On the other hand, with a BDC reticle you are going to be much more limited. There are ways to compensate, but they all end up taking a bunch more time and aren't as accurate when conditions change.
Scot E.