For alpine road riding does fitting a dinner plate 32t cassette make any practical difference over a 28t.
28t will be fine, I usually go 32/34 on a loaded touring bike.
I suspect so. I'm kinda of the thinking that if you can't get up it on 34/28 you aren't going to do it on 34/32 either, and walking would be quicker.
There's a significantly noticeable difference between 32 and 28, however you make do with what you have, the girlfriend rode up a 7% average 15km climb on a 36/25 before and managed just fine.
Short cage mechs from shimano will take a 30t.
XO
Oh. Not sure about SRAM.
@Howard started
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28t will be fine, I usually go 32/34 on a loaded touring bike.