The three point hitch ended up being available from a few dealers in the region, our CC rep, Harry, picked it up and delivered it by hand. Harry also found an available deck through Yanmar and arranged to have it delivered from out of the region on Yanmar's dime. Sorry for still being so vague, I haven't asked about what information I can post for public viewing.
I ended up just using four people to lift out the deck, couldn't get the FEL centered over the bed without impacting the side. Stupid high belt lines and all.
Today was a day off. Last night I removed the back hoe and front end loader and set out everything I would need on a table next to the tractor. The instructions were rather confusing; there were a few incorrect statements and several omissions of steps. I'm not sure, but I think on the 2400, you can just bolt up the lift shaft directly to the frame. On the 2450, you've got to remove four bolts and two nuts, remove the lift points from the frame, disassemble and reassemble the lift shaft with the beefier swivels and reinstall them. The instructions tell you to do this, but don't mention actually assembling the shaft, they say to discard the original bolts and use the new ones, except that doesn't work because they're too short. Then, there's no torque listed for those six fasteners. The issue, I believe, is that there are some reenforcing plates installed with the back hoe. Later on, the pictures show the lift arms installed one way, but it's backwards. You will only find this out after throwing the deck under and finding that nothing lines up. Again, no torque listed for the bolt holding the lift arm retention pin in place. The bend in the up-stop is pictured correctly on the right side, but it is not mentioned in the text. One final issue I didn't address today, the right side of the deck is lower than the left. If I ride it on the wheels, it cuts great, i'll have to fix this before I go cutting long grass.
I did a little test mowing, but it's a swamp out there right now. Seems like the whole machine is quieter than any eXmark i've used, I didn't even need to wear ear protection.