I doubt you'll find a premade fork with the combo of specs you list. One could easily get all but the rake spec from a repair grade fork and then remove what will likely be the extra rake they typically come with.
As long as you like the handling feel of so much trail more power to you. But 78mm of trail is considered to be a LOT. My own touring bikes tend to have about 15-20% less trail.
Don't know where you've been looking for shots of loaded touring bikes but many will also use front panniers on a low mounted rack. In fact i'd say this is considered to be the standard road self contained touring set up. front low rider panniers and rear panniers on standard rear racks.
Some of the goal with long chain stays is for weight balance WRT the front wheel's weight (and front panniers help here, far more than a couple more inches of chain stay). But some of the goal is heel clearance with the rear panniers (which is why some larger rear panniers have their lower front facing corners cut back). Some of the goal is for less chain angle when using wide range gearing/triple cranks. Some of the goal is to relax the handling (although steering geometry is FAR more the issue here).
As to your proposed gearing- Whatever works for you. I prefer a triple crank and parts that are more commonly available then the latest stuff. The 24/34/44 rings and the 11/34 rear cogs provide about a 10% lower gear then your set up does, uses far more easily replaced parts and I never have had a need for a gear larger then about 90 inches (and if I could get a 13/34 cog set I would). I also prefer wider chains and cog plates then the latest stuff have. I run a 9 speed cog set on my tour bikes. My front shifter is not indexed (no road bike I have has an indexed front shifter). But gearing is a very personal choice. I have just found that I always wanted a lower gear then what I was using after a couple of hours on the same hill (or mountain pass). Have you done any touring yet?
Here's a link to a Flicker album of my latest touring bikes. Some of the details are similar to your plans, some are very different. Andy.
https://www.flickr.com/photos/731955...57658194060433