I would suggest that you pick up an old Schick injector (bakelite/plastic handle). They are cheap on the Bay, tiny, and provide a great shave (almost on par with a straight). You could load it with a blade, shave every day if you want and have almost no weight/bulk to deal with. Pair it with a shave stick and you should be in good shape.

Blasphemous, I know, but I really like the shave from the injectors. Safety razor development could have stopped there, in my opinion. If a straight is a must, I would take a Feather.