This question of tools, and particularly their weight, is overblown. I feel that a very basic set of sockets to be able to tighten loosened nuts and do basic things like spark plug removal and even an oil change, tire repair, or basic tuneup, should be the criteria to base what we carry on. A set of sockets, with ratchet, a set of open end wrenches, a few electrical bits and pieces, a few spares, sure it adds up but needn't be overwhelming as to weight. When I do any work on the bike in the shop, I find myself using a number of different sizes of wrenches and such, and what I do in the shop isn't much different than what may be needed in the field.
Well, in a month or so I'll have the whole thing organized and can give a summary of it with weight. They once failed me out of the Boy Scouts as being hopelessly non-conformist, maybe I'll get it right this time and "be prepared".