AA and everyone doing B2B marathon weekends I hope you did well at London. I've never had the nerve to do marathons with a spacing tighter than two weeks. Stockholm at the end of May gives me a pretty reasonable spacing of 5 weeks so I will try to find another 55 seconds to get under 3:20 there.
I run by effort/HR (using the Feelrun MARCO method) so I simply adjust my hill pace to suit, but there is also a very nice pace calculator and text advice at http://runnersconnect.net/boston-marathon-coach/pace-calculator/
This reinforces the point that it is not so much the uphills you should worry about. It's how to get to the long downhill sections near the end without fried quads.
IMO no in view of your background, but they come at a place where people are liable to be bonking anyway. I'd like to do Jungfrau myself - did Swiss Alpine a few years ago.
Basically, if you look at the Strava course and zoom in you see it start at about 28 km and go to 33.5 km. You can remember it because that starts at the only right-angle bend on the course, by the fire station. You know when you reach there you'll have what we'd call a modest climb. (there is one hill just before that too). Then it's coast downhill to the finish