Interesting indeed....how do you plan to drive the front pump?
I've got 2 of those 727 kits in a box on the shelf.I have a complete 727 clutch flight long tail shaft
I think you just need to have a little more faith in the old 904. If I worried about everything I built breaking, then nothing would ever get built.the output shaft would be my area of concern on what would be considered a locked 1-2, 2-3 shift. Right around the thinnest part at the front planetary.
About 260HPNot my concern,merely an observation from what is likely to give out first. What kind of power you planning to put through it?