Okay, I had it my private messages...
A good friend of mine has done exactly what you have proposed. I haven't asked if I could use his name so he shall remail nameless unless he chooses to post here...Here is the result:

30 Luger (Fiocchi) on the left and 7.65x19 on the right. They end up about the same in length more or less. I might note that I did not custom throat my barrel as Esko did, I just relied on the 30 Luger dimensions there.
Here is what else he had to say about the short .30 caliber wildcat:
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Guess the nice thing about the 7.65x19 was ... plenty of 9mm casings around, the dies are not really custom made(just cut down a set of regular 30 Luger). My Lee dies were surface hardened, so it took carbide to shorten them; but once thru the top layer they were relatively soft.
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If you try this idea, let us know how you make out, but remember any liability is your own, the forum can't be responsible for what you are going to try.