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Depends how light you are, how fit you are, and what your climbing style is like. The Alps generally don't get that steep, averaging 7-8% for most climbs. Do you know what sort of power you'll be climbing at? If you do, it's relatively easy to work out your climbing speed, and from that you can calculate your cadence for any particular gearing.
Generally though a 36 inner chainring rather than a 34 isn't a massive difference, so I'd say you should be OK.
Brommers
Will I suffer stupidly in the Alps on 52/36 11x28? This is with the 5800 group. I'd buy a new cassette but annoyingly I have a short cage mech so would need another one of them too.
I'm fairly fit but by no means an animal. I have found myself on 36/28 on the steeper Surrey climbs, for example. I've been told that I'll be fine, but the fact that it was 43 degrees on the Alpe during the Marmotte is making me nervous...