Great call on the B17, after 2 weeks you will have fallen inlove with an inanimate object
since your a tart have a look at a swallow or the new ltd edition engraved chap. Would make a nice momento of your trip too.
Another good call on the Ortlieb gear, mines still going strong after 15odd years.
Other than that good shorts would be my next priority, pearl izumi and spesh BG stuff works for me but everyones different.
I wouldn't worry about the fitness aspect, it really isn't that far and by the end of the fortnight you'll be pissing 50 miles a day. FWIW I wouldn't bother with the 50 mile a day thing, just take it as it comes. Look at the map and decide where your going that day, try not to plan too much and enjoy the free spirit bit
Wouldnae worry about food to much either you'll be ravenous so tuck into the best France has to offer. Sounds like a great trip anyroads, its something you'll remember for the rest of your life
For some inspiration pick up the Alisatir Humphreys books, smashing read