Hey Joe,
Don't get me wrong here, if Isuzu made a diesel VX (for all I know, they did overseas, I have no clue) I'd considering trading-up. However, I just question the cost/benefit ratio of performing this aftermarket modification to a perfectly well-functioning VX.
How much is a new Isuzu diesel engine with a blower these days anyways? Can't be less than $5k....