I replaced all my travel electronics to be powerable from USB-C. This saved me from a lot cables and adapters.
Even re-soldered the cable of my electric shaver to use a USB-C PD adapter PCB. As long it's somehow close to the standardized voltages (5/9/12/18/etc.) there will be no problems.
I'm not trying to be gatekeepy or anything, but in 2009 (not so long ago), I did an "ultralight" 40-day on-and-off-road motorcycle trip without any electronics. A few years before that, I did a 10 week "backpacker without a backpack" trip with no electronics. This is still very possible.
The weight savings, the "escape from electronics" bonus... It's not nothing.
In some places it's no longer possible to travel without a smartphone. For example, where I live you can't buy a ferry ticket without an app. So if I want to travel to another island with a motorcycle, I'll have to bring a smartphone.
Cell phones are a crutch. Us real hikers/backpackers/outdoorians don't need such hand holding as "doing it on easy mode". You look danger in the face and call for help, I look danger in in the face and I say "you ready?". We are not the same.
Fully committing to USB C was a wonderful move. It's much easier to pack for the day, but also for hiking, cycling and motorcycle trips. I wired my motorcycle panniers to have USB C chargers inside them.
And if soldering is beyond your optimization ambition, there's aliexpress where you can find small USB-PD adapters for most electric shavers. It's little niche innovations like this that drive my ordering flow, not saving a few cents.
For those that want to travel light the Panasonic MultiShape[1] is great as you can share one rechargeable base with multiple tools. It is annoying as it's not USB, but inexpensive cables are available[2] and work great.
Can you talk more about this? I have a waterproof Braun one and I was thinking of making. USB-C dongle for it so that I don't have to crack the case and ruin the waterproofing.
You're budgeting for the weight of a safety razor?
Surely the hunting knife you use to kill your dinner when combined with the mirror you use for starting your forraged twig fires, that would be the ultimate solution.
...or just not shave for a few days. I guess you could do that too.
I replaced all my travel electronics to be powerable from USB-C. This saved me from a lot cables and adapters.
Even re-soldered the cable of my electric shaver to use a USB-C PD adapter PCB. As long it's somehow close to the standardized voltages (5/9/12/18/etc.) there will be no problems.