How stable is the climate of your destination? If its likely to be good weather you can get away with packing some light weight jerseys and gilet with some back up thin arm warmers/ leg warmers and emergency rain jacket, if it its more variable you’ll need to pack more and possibly bulkier gear. Some folk are very attached to their particular saddle and its a must for comfort but I wouldn’t be one of them. With big changes in climate and elevation when I go abroad I don’t know how usefull a powermeter would be (I’ve always went of RPE/ HR when I’ve went abroad) but if you are taking pedals anyway (usually the requirement of a hire company) taking them won’t make much difference.