I talked to Keith about the P-pump upgrade and his feeling was even if they offered this upgrade as a kit it would still be $6K or more to complete. Evan Beck was going to do this in the near future to his '01 ETH 2wd but last time he was at DD they kinda talked him out of it (if you broke down on the road getting repairs & replacement parts could be a problem, if you crack an injection line you're screwed, etc. ). Bascially it's not a good game plan if you're going to be out on the road a lot.
From what I gathered they haven't done very many P-pump upgrades, and the electronics side of the project is the easy part.
Now that some of the issues have been worked out on the VP44 and guys have been cranking out some serious HP I see no reason to invest in a P-pump conversion.
Another thought is to take a 12V and put a 24V head on, but that would require a piston swap-out and custom lines, but other than that it would probably be an easier project.
Vaughn