Why even consider a 1x, given that you'll be carrying camping stuff? A 42/28 double gives you so much better range. The shimano grx or whatever it is seems like a great option , but you'll have to research the details.
Mechanical discs work rather well, certainly the popular ones do that are tried and true, spyre, old school bb7s.
when carrying any load, lower gearing has no downsides, and a 42-11 will still get you to a good 55kph to spin out speed with 700 wheels, but all the times a 20 gear inch or less low gear will get used is way more important.
just be wary of thinking that a 1x is the bees knees.
also as a roadie be wary of your expectations of what is needed for a low gear.