It may be worth your time to enforce a very strict routine over a period (the morning is a good example, as long as sleepiness is not making things extra difficult) for a couple of weeks and see if it starts to stick; this is something that can make a big difference, and it is worth knowing if it can work for you.

However, I agree that this is not likely to be a magic bullet in your case.

Have you tried something like a smartphone with an extensive checklist/schedule? It has the benefits of coming with you almost everywhere, and having alarms for particularly important events.

This is a subject that interests me, and I'd like to know more about what you do and how it works. You have simplified matters by making your environment more flexible (e.g. razor in the car); is that something that has a halo effect -- one less thing to go horribly awry, so you are less stressed and can function a little better overall -- or is it just a solution to forgetting to shave, and that's all? Are there other solutions that have worked for multiple problems? Are there any problems that you have found no solutions for?