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?
This thread is for asking the rationalist community for practical advice. It's inspired by the stupid questions series, but with an explicit focus on instrumental rationality.
Questions ranging from easy ("this is probably trivial for half the people on this site") to hard ("maybe someone here has a good answer, but probably not") are welcome. However, please stick to problems that you actually face or anticipate facing soon, not hypotheticals.
As with the stupid questions thread, don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better, and please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
(See also the Boring Advice Repository)