We can now say with absolute certainty the 3DO version did exist at one time. According to our previous findings, it would have launched on the same day as the Sega Saturn/PlayStation version. Less-than-stellar sales of the 3DO, itself, presumably led to the game's cancellation.
But who knows? Perhaps one day it will leak out onto the net. Even if it appears to have been a straight port from the PlayStation/Saturn version, I think it's worthy of preservation!
Thanks again, KeijiDragon!