3.9 Stroker

You are right it can't be done. No one could ever make it work... even.
Hmmm, well, I don't recall saying or hinting anything "can't" be done.... it's one of the terms I Freakin' hate. OP stated He did not want to do it, and it is not a "drop-in", but You seem hell-bent on talking Him into it....for no real reason other than "that's what I'd do".
He asked about a stroker crank if the crank needs replacing, have a nice eve. Dude....