prolly won't have a problem with gear/brake cables, but they're light,
carry one spare long one each....do cut off the unusable end before
you leave. but cable housing? no.

that pedal/headset combo is a beast. leave it. need more hex keys,
go over all the bolts on your bike, including on the bag attachments.
you got a torx to adjust your disc brake pads, or remove the disc?

you got more electronics that i got in my whole house. how much do
you really need? selfie stick? just. say. no.