Hey Tynan,
I have the same model of Philips One toothbrush as you mention here. I also hate the proprietary plug.
However, I noticed that some adapters are listed on Amazon. It's not as good as just having a USB-C port natively, but still a lot less to carry!
https://a.co/d/06Wk8ryL
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They sell a USB-C native version of the Philips One, I bought mine off amazon.