I don't mind typing the notes once I'm in front of a real computer, I just don't want to do the "note to myself" while in public. And otherwise, I haven't found

I don't mind typing the notes once I'm in front of a real computer, I just don't want to do the "note to myself" while in public. And otherwise, I haven't found anything that gets me to capture things like "note: buy eggs" or "note: consider PEGs for the query builder optimization" fast enough. (Opening an app and laboriously using the mobile keyboard don't do it for me in the long run and just cause me to drop GTD again). Maybe I should get one of those wearable chord keyboards from the late 90s and connect it to an always-on note-taking applicance...